1. The development history of memory stick
The development of Sony memory stick has gone through several periods, namely: Memory Stick (blue strip and white strip) - Memory Stick DUO - Double-sided 2×128MB Memory Stick - Memory Stick PRO - Memory Stick PRO Duo
The earliest memory stick had only one size, measuring 50×21.5×2.8mm and weighing 4 grams. Memory sticks are divided into blue strips and white strips. The white strips have copyright protection function and are more expensive than the blue strips. Since the capacity of early memory sticks was set at 4MB to 128MB from the beginning, and specifications were formulated based on each capacity, it seems that 128 MB is already the limit of ordinary memory stick storage chips, and it is difficult to achieve a capacity of more than 128MB.
In order to meet the needs of some users, Sony has developed a double-sided 2×128MB memory stick, namely Memory Stick Select. It can flip a small switch on the back and after using one side, you can turn it over and use the other side. . The capacity is only 256 MB (128 MB x 2) available.
Later, Sony designed and manufactured the Memory Stick Duo based on the memory stick. The biggest difference is that the size is reduced to 1/3 of the ordinary memory stick, with an external size of only 31×20×1.6 mm, the weight is also doubled, about 2 grams, which is similar to the xD card and is very easy to carry. And through the included expansion card, compatibility is also guaranteed, and devices that can use ordinary memory sticks can use small memory sticks.
Based on the reduced size of Memory Stick Duo, in order to obtain greater capacity and higher speed, Sony has developed Memory Stick PRO, which is an enhanced memory stick with faster reading and writing speeds. . This new type of memory stick has the same appearance and size as ordinary memory sticks, but it has the highlights of large capacity and fast speed. Theoretically, enhanced memory sticks can achieve a maximum capacity of 32G. Currently, enhanced memory sticks are available in capacities of 256MB, 512MB and 1G. The reading and writing speed is 8 times that of the old-fashioned memory stick, which plays a vital role in improving the capture speed of news and sports reporters. Theoretically speaking, in the past, ordinary speed reading and writing between the memory stick and the card reader used a single-channel serial communication method, and the maximum transmission rate was only 20Mbps. However, the high-speed reading and writing of MemoryStick Pro uses 4-channel parallel communication, so that the maximum transmission rate can be Reach 160Mbps. At the same time, it uses a minimum read and write speed of 15Mbps as the format standard. In addition to serial transmission, Memory Stick PRO also supports parallel transmission to achieve simultaneous transmission and reception of multiple data. In parallel transmission mode, data is transmitted at a speed greater than 160Mbps (theoretical value), making it possible to record DVD-quality moving images in real time. Owning this high-speed Memory Stick PRO can also support the advanced solutions brought about by the upcoming broadband era. It can also prevent data loss caused by sudden power outages or movement of the recording media; Memory Stick PRO does not have blue bars or white bars, and all Memory Stick PROs have copyright protection functions. Because the Memory Stick PRO memory stick format offers large capacity and fast data transfer, its own advanced technology and expandability greatly expand the scope of Memory Stick fun when the media is combined with the appropriate compatible products. For example, the Memory Stick PRO memory stick can record high-resolution short videos in real time. It also allows many other advanced solutions of the broadband era to operate in a reliable and secure environment.
Although Memory Stick PRO incorporates many new technologies, on the other hand it sacrifices compatibility with original memory sticks. Older devices will not be able to use this new Memory Stick PRO, which means that devices that support Enhanced Memory Stick can use Enhanced Memory Stick and regular Memory Stick, but devices that support regular Memory Stick cannot use Enhanced Memory Stick. However, digital products produced now with Memory Stick PRO slots are backward compatible and can use traditional Memory Sticks.
In March 2003, Sony designed and manufactured the Memory Stick Pro Duo based on the Memory Stick PRO. It is an improved product that supports the parallel interface of the past Memory Stick Duo.
Memory Stick PRO Duo packs and compresses all the advanced functions of Memory Stick PRO into Duo format, which uses higher-density overlay technology. In addition to serial transmission, Memory Stick Pro Duo also supports parallel transmission and can transmit data at a speed of 160Mpbs (theoretical maximum). This medium responds to the increasing use of advanced applications in the broadband era, providing a quick and easy way to reproduce high-resolution digital images, as well as large-capacity presentation data. Can record 190 5-megapixel JPEG photos, or 12 minutes of MPEG2 DVD-quality moving images; memory stick allows recording of copyright-protected content and high-speed data transfer, providing secure downloads and an environment for playing copyright-protected content. It provides the possibility to protect the security of personal data and top-secret information. Memory Stick Pro Duo maintains high compatibility across a wide range of products, including small mobiledevices. By connecting the adapter, it can also be used with products compatible with standard size memory sticks.
2. Advantages and Disadvantages of Memory Stick
Compared with other memory cards, Memory Stick has its own advantages and disadvantages.
(1) Advantages of the memory stick
First of all, the shape of the memory stick is designed according to the principles of ergonomic mechanics. Users can easily distinguish the front and back from the bottom to avoid misuse. As a result of accidental data loss, its compact size is also suitable for the development of small portable products.
The second is that the memory stick is very reliable because it uses a transistor structure with no moving space, so the memory stick is designed to be highly resistant to vibrations. The connection parts and pins are well treated against shocks, and the memory stick only has 10 pins. The longer length can better ensure the reliability of data exchange. And the shape of the memory stick makes it easy to insert into the product, which is more conducive to the reliability of data exchange.
The third is that the memory stick has a self-cleaning design. Since its guide slot is tilted, dust will be automatically removed when the memory stick is inserted into the slot. The unique guided slot prevents users from directly touching the connection pins, thereby avoiding damage to the memory stick caused by dust or static electricity.
The fourth is to prevent users from accidentally losing important content and data by pulling the deletion prevention switch on the back of the memory stick.
(2) Disadvantages of memory sticks
First of all, technological closure is a major flaw of memory sticks, especially before 2002, memory sticks were basically only produced and sold by Sony. And can only be used on Sony's digital products. This situation has changed to a certain extent since the invention of Memory Stick PRO at the end of 2003. With the advancement of Sony's open strategy, the use/production/sales of Memory Sticks began to be authorized to many other brands. This has enabled the further promotion of memory sticks in the digital consumer market. Companies such as Samsung/lexar/Sandisk/Apacer can now also produce and sell their own brand memory stick products. Electronic products from more manufacturers are also authorized to use Sony's memory sticks as storage media. Among them, many digital camera products from Samsung and Konica adopt dual-slot designs.
Secondly, high prices are also an important reason why people are hesitant to buy Sony memory sticks. This problem has even affected the sales of Sony digital cameras and other products. However, Sony has obviously realized this problem. The current price of Sony memory sticks has dropped significantly and has begun to approach other memory cards.
3. How to distinguish the authenticity of a memory stick
The memory stick products currently on the market are mixed, and there are many fakes among them. So how can you distinguish the authenticity of the memory stick products when purchasing them?
First of all, if you look closely at the label of the memory stick, you will find that the text on the genuine product is laser-etched, while the text on the fake product should be printed. The genuine fonts are clear and bright, more textured, and have a strong three-dimensional effect. The fake ones obviously only have simple black fonts, and the cover of the interface of the fake ones is obviously thicker. If used on some machines, the memory stick may not be able to automatically eject because the cover is too thick
In addition, in terms of performance, the transfer speed of fake memory sticks is much slower than that of licensed products, and the transfer speed of genuine products may be four times that of fake ones.
Fake memory sticks may cause access errors from time to time, or even cause crashes and other malfunctions. At the same time, the capacity may become smaller or simply broken after being used for a long time.
The third season, the ultimate guide to MMC card selection
1. Understand MMC card
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MMC card
MMC card A multi-functional memory card jointly developed by the American company SANDISK and Germany's Siemens in 1997. The MMC card uses a 7-pin interface and is mainly used in digital cameras, mobile phones and some PDA products. It is relatively expensive. . MMC card improves the shortcomings of slow reading and writing speed of CF card to a certain extent, and is lightweight, measuring 32mm × 24mm × 1.4mm, and weighing less than 2 grams. It has strong impact resistance and can be read and written repeatedly 300,000 times. . The MMC card 4.0 standard provides wider data bandwidth and faster transfer rates, and supports dual-voltage operation mode. Working in 52MHz, × 8 bit mode, the data transfer rate can reach 52MB/s. Due to the later introduction of SD. The card standard retains the compatibility of devices with MMC cards, so although devices using MMC cards cannot use SD cards, devices using SD cards can easily use MMC cards. This year, Pretec announced the extremely fast 2GB card that complies with the MMC4.0 standard. With the advent of MMC memory cards, the capacity of MMC cards has begun to approach that of CF cards.
The RS-MMC card (Reduced Size MultiMediaCard, a smaller size multimedia card) developed by Hitachi Manufacturing Co., Ltd. was originally a smaller size multimedia card. On a very small basis, the shape is exactly half of an MMC card, and the length is a little longer than half of an MMC card (MMC is 32mm in length, RS-MMC is 18mm in length) and can also be used as an MMC by installing a special adapter on the back. card. It is more in line with today's mobile digital era, which requires smaller size, lighter weight and larger capacity.
2.
There are many brands of MMC cards on the market now, such as sandisk, kingmax, TEC, PQI, PDI, DEC, Nplus, etc. In terms of quality, you cannot just look at the brand, because the same brand has both bad and good products. It has high compatibility. The price of PQI is the cheapest among MMC, so now there are more products using PQI brand. Of course, there are more fakes. There are two kinds of PQI MMC cards on the market, one is the low-end card of the first generation. Speed ??Blue Dolphin card, this blue card has the most fakes, I suggest you not to buy it. The second one is the orange second generation card. If you must buy PQI, it is recommended to buy orange card. There are also several other good brands. For example, EagleTec, kingMAX, and SanDisk.
As for the choice of MMC card capacity, generally speaking, buying 128M or 256M is enough. From the perspective of actual use, MMC is mainly used for storage applications. Software, images, etc., are best equipped with products above 256M. In addition, when purchasing, you must first try to see if it can be used. Of course, just "working" is not enough, and you must also check whether it is fully compatible. When buying a card, it is best to take the machine with you and try it out in person. Finally, check to see if there are any scratches on the MMC contact points, which are usually not found on new cards.
3. How to identify the authenticity of MMC cards
The following takes the PQI memory card as an example to talk about how to identify the authenticity of MMC cards
(1) In terms of appearance, the patterns and text printed on the surface of genuine PQI The color is bright, while the counterfeit products are dull in color and the text is not very clear; in addition, there is a series of product numbers engraved on the bottom of the genuine products, but the counterfeit products do not.
(2) All PQI products are labeled with laser anti-counterfeiting labels. Genuine laser anti-counterfeiting labels have the word "PQI" on them, but counterfeit products do not.
(3) PQI has passed the National Quality Inspection Association and has fully launched the 800 code anti-counterfeiting system.
There will be a service card in the packaging of genuine PQI products. There is an 800 anti-counterfeiting code visible on the back of the card. Users only need to dial the 800 toll-free inquiry number and enter the anti-counterfeiting code on the card to immediately identify the authenticity of the product.
The fourth quarter, the ultimate guide to SD card selection
1. Understand SD card
SD card is the abbreviation of Secure Digital Card, which is literally translated into Chinese as "Secure Digital Card". It is a new product jointly developed by Panasonic Corporation of Japan, Toshiba Corporation of Japan and SANDISK Corporation of the United States. memory card products. SD memory card is a completely open standard (system), mostly used in MP3, digital camcorders, digital cameras, e-books, AV equipment, etc., and is especially widely used in ultra-thin digital cameras. The SD card is consistent with the MultiMedia Card in appearance, is slightly thicker than the MMC card, and has a much larger capacity. And compatible with MMC card interface specifications. People can't help but suspect that the SD card is an upgraded version of MMC. In addition, the SD card has 9 pins, and the purpose is to increase the transmission speed by changing the transmission mode from serial to parallel. Its reading and writing speed is faster than that of MMC card, and at the same time, it is more secure. The biggest feature of the SD card is that it can ensure the security and confidentiality of data through the encryption function. It also has copyright protection technology, and the copyright protection technology used is the CPRM technology (Content Protection for Recordable Media) used in DVD.
2． Characteristics of several major brands of SD cards
There are many brands of SD cards on the market, and the well-known brands have their own characteristics.
SANDISK: The SANDISK brand of SD cards may be the most common on the market. "Blue cards" like this can be bought in basically every digital store. In fact, not all SANDISK SD cards are low-speed, there are also high-speed models (black cards), but it seems that they are not sold in the local market yet.
Kingmax: As a manufacturer of branded memory, KINGMAX has been committed to the development of memory cards in recent years. It uses a unique integrated packaging technology (PIP), making it difficult for counterfeiters to imitate. The Kingmax SD card has a maximum transfer rate of 10MB/sec. It has waterproof, shockproof performance, and anti-pressure three-proof design. It can meet various needs of outdoor shooting. Require.
Panasonic: As the creator of the SD standard, Panasonic’s technology can be said to be one of the best SD cards on the market. However, most Panasonic SDs on the market do not have a warranty, so you must ask the important question of the warranty period when purchasing.
Kingston: As the world's largest memory manufacturer, Kingston's SD cards eliminate the need for interface circuits, so among many flash memory products, they are the smallest (only about the size of a postage stamp). , weighing less than two grams), which is why many digital cameras, MP3 players and handheld computers have chosen SD cards as their storage media. Just because of the size of the product, it is difficult to increase the capacity of the SD card. In addition, all Kingston's SD card products provide a warranty of up to 5 years.
3. How to identify the authenticity of SD cards
SD cards are small in size and the average consumer does not know much about them before buying them, so it is difficult to distinguish them from their appearance. Here is an introduction to the common SanDisk brands on the market How to identify the authenticity of an SD card: First, look at the memory card itself. Genuine Sandisk memory cards have a laser color-changing label on the front, and the laser color changes at different angles. Secondly, there are genuine licensed cards issued by domestic agents, which are all packaged in a plastic package similar to the one above, but the words "5-year guarantee" and Japanese on the lower right have been changed to a graphic representation of 5-year warranty.
In addition, you can also make the simplest identification based on whether there is a gap at the bottom of the SD card. Since the number above the place of origin on the back of the genuine SanDisk brand SD card is unique, the authenticity can be checked through the 800 phone number, but it is said that This query system is not ready yet.
The Ultimate Guide to Selecting Season 5 and xD Cards
1. Learn about xD card
xD card is a new type of memory card jointly launched by Japan's Olympus Co., Ltd. and Fujifilm Co., Ltd. It has an extremely compact appearance, only as big as a postage stamp.
The appearance size is only 20×25×1.7mm, and the weight is only 2 grams. It can be regarded as the smallest in the field of memory cards. It uses a single-sided 18-pin interface and theoretically has an image storage capacity of up to 8GB. It is understood that this year Fujifilm and Olympus jointly launched an xD card with a storage capacity of up to 1GB. Moreover, its reading and writing speed is also higher (the reading rate is 5MB/S, the writing rate is about 3MB/S), which can meet the needs of writing large amounts of data. The power consumption is also lower. The xD-Picture memory card can not only be used simultaneously It is an adapter card for PCs and USB card readers, making it very easy to connect to PCs. It can also be used with a Compact Flash adapter and allows it to be used as a Compact Flash card storage medium in digital cameras. Although the current price of xD cards is somewhat expensive, as the prices of flash memory chips and other memory cards continue to decline, there will be greater room for price reductions in xD cards.
2． Expanded use of xD cards
Now there is an adapter card that can convert xD cards into SM cards, so that previous digital cameras can also expand their photo storage capabilities. This adapter card was originally Used on card readers. For some card readers that are not very new, xD cards are not supported, but SM cards are generally supported. Insert the xD card into the adapter card, and then insert the adapter card into the card reader. The card reader can read the xD card. But now it has a new purpose - insert it into the memory card compartment of a digital camera and use it as an SM card without closing the lid
3. Precautions for using xD cards
(1) Try not to format the xD card with a card reader, otherwise it may cause the card to be formatted incorrectly, making it unable to store photos and causing a crash.
(2) When using a card reader to transfer images, you should use the copy operation and do not perform the cut operation. When deleting, you can only use the delete function of the digital camera itself. Otherwise, it may cause memory card failure.
Digital camera memory card shopping guide
With the continuous popularity of digital cameras, MP3 players, PDAs and other digital products, accessories closely related to them are also becoming more and more popular among consumers. focus on. For example, the memory card of a digital camera does not itself affect the quality of shooting, but it plays a vital role in the use of the camera, and most of the dealer's profits come from here. When we buy a digital camera, it has a huge impact on the overall cost-effectiveness.
The logistics team behind the world of color
When it comes to various types of memory cards, everyone must be very familiar with them. You can name them with your eyes closed. However, the specifications of memory cards The problem of non-uniformity also makes many friends feel at a loss when choosing a digital camera. Before we start talking about purchasing, we still need to briefly understand the characteristics of various memory cards.
There are currently four most popular types of memory cards on the market: CF card, SD card, MS memory stick and micro hard drive. CF cards are the most widely used and the cheapest; SD cards are small in size and have a range of applications that can surpass CF cards, but are more expensive than CF cards; MS memory sticks are only supported by SONY devices, have a narrow range of applications and are also the most expensive. .
For those players who use professional or semi-professional digital cameras, or work outdoors for a long time, they need a large-capacity micro hard drive. Common capacities of microhard drives currently on the market range from 1GB to 4.4GB.
If divided by the purchased brand, it can be roughly divided into three categories: brand memory cards produced by each digital camera manufacturer, most of which are small-capacity memory cards that come with the machine; brand memory cards produced by famous memory manufacturers ; Various compatible memory cards.
When purchasing a digital camera, you will usually get a memory card with a smaller capacity that comes with it. This capacity varies according to the grade of the camera, but generally the capacity is small (less than 32M), which is very convenient. It is difficult to meet daily shooting needs, so we usually buy another memory card with a larger capacity. If you are using a digital camera or digital SLR camera with more than 5 million pixels, it is recommended to choose a memory card with a capacity of more than 256MB in one step.
Principles for purchasing memory cards
Although the storage market is a mixed bag, there are still rules to follow. As long as you master the essentials, you can avoid many unnecessary troubles. In order to avoid buying shoddy memory cards, the author will talk about the methods of purchasing genuine memory cards and common misunderstandings in purchasing.
1. Appearance and workmanship. When purchasing, you should start with the appearance, just like when purchasing other computer accessories. We should pay attention to whether the printing quality of the package is clear and whether there is an anti-counterfeiting label. If there is a verification phone number, it is best to call on the spot to verify the identity, then unpack it in person and check whether the accessories, such as card sleeves, instructions, write-protect stickers, etc., are complete. Finally, look at the overall manufacturing process of the card to see if there are deformations, bumps, cracks, and whether there are burrs on the edges of the card.
2. Compatibility. There are also certain incompatibility issues between different brands of memory cards and digital cameras. Incompatible situations generally manifest as slow access speeds, long card reading times, and even crashes. Therefore, it is best to take the machine to the dealer in person to try the card to ensure that the card matches the machine. Sometimes you should also pay attention to the compatibility issues caused by different models of the same type of cards. For example, CF cards are divided into two types: TYPEI and TYPEII. In addition, it is also necessary to consider whether the working voltage of the memory card is the same as the voltage provided by your own camera.
3. After-sales service. Generally, memory card manufacturers promise to provide one-year replacement. Consumers must ask clearly when purchasing. It is best for the manufacturer to have a written commitment in the product manual. Finally, remember to invoice. Don’t get it at a non-invoicing price just to save a few dollars. You will regret it when something goes wrong.
4. Access speed. As the number of image sensors used in digital cameras becomes higher and higher, our requirements for photo quality and accuracy are getting higher and higher. When these high-performance digital cameras take high-resolution photos, they need to convert image files exceeding 1M in size. Quickly store to the memory card. At this time, the access speed of the memory card is more important. The access speeds of different grades of memory cards may differ dozens of times, and the speeds of different memory cards used on the same camera will also vary. Of course, if conditions permit, you can choose a large-capacity high-speed card.
Purchasing Misunderstandings
During the purchasing process, pay attention to identifying second-hand, returned and shoddy memory cards. First, check whether the package has any traces of repackaging. After opening the package, check whether the nameplate sticker on the surface of the memory card is stained. Secondly, check whether the plastic shell around the memory card is scratched, especially whether the guide slots on both sides are inserted into it. There are obvious traces of insertion; finally, check whether the pin holes of the inserted end are worn or scratched by the pins of the camera's internal slot when unplugging and unplugging. If the above points are checked and no problems are found, it is basically certain that the card is a new card that has not been opened.
Three important things to know to help you choose a memory card for digital devices
No one can live without a small memory card. The emergence of "flash memory" has made digital devices even more powerful: it can access data very quickly, and at the same time, the saved data will not be lost even if the power is turned off. With the increasing popularity of digital cameras, more and more money is being invested in the purchase of memory cards.
I bought a first-class digital camera, but accidentally equipped it with a super poor memory card. I had to wait for a long time to take pictures, and the capacity shrank greatly. All kinds of "bad things" are regrettable - let down Got a good camera. To avoid regrets, this article will introduce some methods of purchasing memory cards to make your digital life more perfect.
Note 1: Don’t be dazzled by the wide variety of products
Xiao Fan bought a digital camera not long ago. The whole family went out for an outing on weekends, with blue sky, white clouds, and pastoral scenery... As they were happily taking pictures, Xiao Fan suddenly realized that the memory card capacity was insufficient. The memory card that originally came with the camera has a capacity of only 32M. Therefore, Xiao Fan decided to buy a larger capacity memory card. But when I went to the computer store, I was a bit dumbfounded. There were so many types of memory cards, which one should I buy?
Resolving doubts
On digital memory cards, there are so-called "four kings", which refer to CF card, SD card, memory stick and xD card respectively.
CF card is the earliest memory card. Currently, there are two specifications available on the market: Type I and Type II. Traditional CF cards have the characteristics of large capacity, but they are also large in size and are not suitable for use in compact digital cameras and mobile phones. Compact digital products mostly use SD cards. The biggest feature of this card is its small size.
Memory sticks are patented by Sony and can usually only be used in Sony's digital cameras and digital camcorders or products from manufacturers that have obtained the rights to use their patents. xD cards are commonly used in Fuji and Olympus digital cameras. It is relatively small and has a large capacity, but it is expensive. In addition, there are SM cards, MMC cards, etc., and new memory card formats are constantly emerging.
Intimate shopping guide
When buying a card, you must first determine the type of card, which is generally determined by the model of the digital camera. Sony products (except F828) can only use memory sticks; almost all Panasonic digital cameras use SD cards; Fujifilm and Olympus digital cameras use xD cards; CF cards have the widest range. Some digital cameras can use multiple cards, please refer to the camera manual to determine. If there are other digital devices, you should try to choose the most versatile type. When buying a card, be sure to bring the camera with you, or buy the memory card together with the camera.
The memory card capacity should be determined according to actual needs. When you buy a digital camera, it will come with a memory card with a smaller capacity, generally no more than 32MB, which is insufficient for taking high-precision photos. Therefore, it is recommended that ordinary users purchase a 128MB memory card. If you use a digital camera with more than 6 million pixels, it is recommended to choose a memory card with a capacity of more than 256MB in one step.
Note 2: Detailed identification of genuine and fake goods
Ms. Li bought a memory card with a capacity of 128MB. After using it for a few months, she found that sometimes she could not store photos when using it. , sometimes although the storage is successful, it cannot be read. Ms. Li remembered that the merchant had promised a one-year warranty when she purchased it, so she took the memory card to the merchant where she originally purchased it, only to find that the building was empty. Knowledgeable friends judged that they bought fake products. Although Miss Li was very upset and bitter, she could only swallow it by herself.
Resolving doubts
Fake memory cards generally use inferior flash memory chips and do not undergo strict product testing before leaving the factory. After being used for a period of time, some chips may experience data corruption or the card may not work properly. In severe cases, it may cause damage to other devices. At the same time, there is no quality guarantee for fake goods. Even if the merchant swears that it can provide warranty, does a small shop have such ability?
Intimate shopping guide
To identify genuine and fake memory cards, you must first start with the outer packaging. The outer packaging of famous brand memory cards is generally very well made, with a regular laser anti-counterfeiting label on the back. The outer packaging of fake cards generally has some problems. The surface stickers are yellowed and have a shoddy feel. The characters are unclear and there are usually no anti-counterfeiting labels. However, the printing quality of the outer packaging of some fake products has been greatly improved, and anti-counterfeiting labels have begun to appear on the back. Then you can only rely on the anti-counterfeiting inquiry phone number 8008102365 (010-12365) or the website 95315 (/) to know the authenticity of the card.
The second thing is to look at the card itself. Observe whether the memory card is cracked or deformed, whether the surrounding plastic shell is scratched, whether there are bubbles on the surface, whether the edges are smooth or have burrs, whether there are obvious signs of insertion in the insertion guide grooves on both sides, and whether the feet on the inserted end are Check whether the hole is scratched by the pins of the camera's internal slot when unplugging or plugging it in. If so, do not do it.
When purchasing, it is recommended to choose products from major manufacturers and famous brands. Most of these products promise one-year replacement. It is best to buy from a relatively large dealer or a dealer designated by the manufacturer. When buying, be sure to ask about the warranty period and method, such as how many days can it be returned due to quality problems, how long can it be replaced, etc. Finally, remember to issue a formal invoice.
Note 3: Don’t ignore the reading and saving speed
Mr. Yuan is a digital photography enthusiast. He carries a digital camera with him, and when he sees interesting people or things, he will record them with his camera. One day, he encountered an unexpected incident on the road. He took out his camera and prepared to capture the fleeting precious shots. However, the red light saved by the camera kept flashing. Seeing the shooting opportunity slipping away before his eyes, Mr. Yuan I feel very sorry. Mr. Yuan consulted industry insiders and the advice he received was to purchase memory cards with higher access speeds.
Resolving doubts
When purchasing a memory card, in addition to the factors mentioned above, the speed of the memory card is also an important consideration. If you carefully compare memory cards from different manufacturers, you will find that some cards are marked with "HighSpeed" (meaning high speed), some can see the words "40x" (meaning 40 times speed), and some have nothing on them. This is the difference between the so-called high-speed card and low-speed card.
The doubled speed of a memory card is 150KB/s, and 40x is equivalent to 6MB/s. The reading speed of the memory card refers to the speed of reading the saved digital photos, and the access speed refers to the speed of writing the picture files to the memory card during shooting.
When high-performance digital cameras take high-resolution photos, they need to quickly store large picture files on the memory card. Therefore, the access speed of the memory card is very important.
Intimate shopping guide
On what basis should users choose high-speed cards or low-speed cards? Experts suggest that users who use semi-professional or professional cameras should give priority to high-speed cards to meet the transmission requirements of large-capacity files such as high-pixel, RAW or TIFF photo formats.
Generally speaking, ordinary users can make a purchase decision after weighing the price and do not necessarily have to choose a high-speed card. Because some mid-to-low-end digital camera products have CCD photoreceptors, components used, and technical reasons, even if they use high-speed memory cards, it is difficult to show the speed advantage. The actual test also showed the same result. For ordinary cameras with low pixels and weak continuous shooting capabilities, the difference between high-speed cards and low-speed cards in actual shooting will be less than 1 second, which can be said to be so small that it is difficult to detect.
Tips for buying cards
1. Bring a digital camera to buy a card. When buying, try continuous shooting in uncompressed format (TIFF). The memory card will soon be Fully occupied. Then bring it up to see if there is anything wrong with the photo. If there is no problem, it means the memory card is good.
2. Even if it is a genuine product produced by a famous brand manufacturer, the nominal capacity of the product will be different from the actual capacity. The reason is that the product nominal is calculated based on 1MB = 1000KB, but the actual detection uses the standard of 1MB = 1024KB, so there will be some differences. For example, the nominal capacity is 512MB, but the actual capacity is 512×1000×1000=512000000B. If calculated according to 1MB=1024KB, then 512000000÷1024÷1024 is approximately equal to about 490MB. Digital cameras use FAT16 or FAT32 file format (1MB = 1024KB), so the displayed result is about 490MB.
Eight tips to make digital memory cards last longer
With the popularity of digital devices, memory cards (such as SD cards, CF cards, memory sticks, etc.) have also become indispensable accessories. But memory cards are relatively delicate things. Careless use and handling may cause the information on the memory card to be lost or even damaged. The following 8 precautions can help your memory card have a longer life.
Do not hot plug, insert the card in place, be careful when taking it out, transfer data frequently, format carefully, avoid vibration when working, avoid the environment of three highs (high magnetism, high temperature, high humidity), and avoid heavy pressure when collecting. .
Digital