If there are serious scratches, it is very old ~
And whether the interface between plug-in power supply and data line is corroded.
See if there are any scratches on the screws of the hard disk. If it is refurbished, the screws will be damaged.
Seagate hard disk model identification method
Seagate hard disk number is relatively simple, and its identification method is "ST+ hard disk size+capacity+primary identification+secondary identification+interface type".
In order to make it easy for everyone to understand, it is simply expressed as: ST "X, XXXX, XX, XXX", which means that the hard disk number can be divided into four parts.
First of all, "st" stands for "Seagate", which means Seagate products.
Then the "X" in the first part indicates the shape and size of its hard disk. "1" refers to a 3.5-inch full-height hard disk with a thickness of 41mm; "3" refers to a 3.5-inch half-height hard disk with a thickness of 25 mm "4" refers to a 5.25-inch hard disk with a thickness of 82mm; "5" denotes a hard disk with a size of 3.5 inches and a thickness of19mm; "9" means a 2.5-inch hard disk.
The four "X's" in the second part represent the capacity of the hard disk, which usually consists of 3 to 4 digits in GB. For example, "1600" means that the capacity of this hard disk is 160GB, while "400" or "800" means that its capacity is 40GB or 80GB.
The two "X's" in the third part are hard disk signs, which consist of main signs and auxiliary signs. The previous number is the main symbol, which refers to the number of disks in Seagate's IDE hard disk. For example, the number "2" means that the hard disk uses two disks. In Seagate's SCSI hard disk, its main symbol refers to the speed of the hard disk. With the main logo, of course, there will be a secondary logo, and the number behind it is the secondary logo. Only when the primary identification is the same or invalid, the secondary identification is meaningful. It generally represents the performance and algebra of the hard disk. The bigger the number, the higher the algebra, the better the performance and the newer the hard disk.
The three "X" in the third part are mainly composed of 1 to 3 letters, indicating the type of hard disk interface, etc. The general desktop IDE hard disk is relatively simple, but if it includes the current and early SCSI hard disks, its meaning becomes more complicated.
"A" refers to the interface of ATA UDMA/33 or UDMA/66 IDE.
"AS" means the interface of serial ATA 150.
"AG" stands for ATA interface dedicated to notebook computer.
"n" means a 50-pin Ultra SCSI interface with a data transmission rate of 20 MB/s.
"W" stands for a 68-pin Ultra SCSI interface with a data transmission rate of 40 MB/s.
"WC" stands for the interface of 80-pin Ultra SCSI.
"FC" stands for optical fiber, which can provide data transmission rate as high as 100MB/s and support hot plug.
"WD" stands for the interface of 68-pin ultra-wide SCSI.
"LW" stands for 68-pin Ultra-2 SCSI(LVD) interface.
"LC" stands for 80-pin Ultra-2 SCSI(LVD) interface.
Let's take Seagate Cool Fish hard disk "ST3 160023AS" as an example. Through the serial number of the example, we can know that the hard disk is a 3.5-inch half-height hard disk with a thickness of 25mm produced by Seagate Company. It uses two hard disks with a total capacity of 160GB serial ATA 150. In addition, if you see the characters such as "7200.7" printed on the hard disk, it means that this is Seagate's new hard disk series with 80GB storage per disk; When you see the words "Barracuda 7200.7 Plus", you will know that this series of products are high-end products, 8MB cache, serial ATA 150 interface or Ultra ATA 100 interface.
Key words: hard disk, data recovery, Shanghai data recovery, hard disk data recovery, Shanghai hard disk data recovery.
Hitachi inherited the advanced technology of IBM hard disk.
Since Hitachi merged with IBM's hard disk division, Hitachi has inherited IBM's hard disk technology. As we all know, IBM is the world's largest memory, and many breakthrough memory technologies in history came from IBM. For example, the prototype of the most typical modern hard disk (Wen's hard disk) was developed by IBM. Of course, there are also the "MR" and "GMR" magnetic heads that were widely used later, and their famous "fairy dust" technology. Although its performance in the domestic market is average at present, its strong background and strength can not be ignored by anyone.
Key Skills Hitachi180Xp Series Model Recognition Method
Hitachi hard disks have two series: 180GXP and 7K250, and it is complicated to identify their serial numbers. 180GXP series follows IBM hard disk number. Its identification method is: "IC+ disk size+hard disk height+capacity+interface type+serial port model+speed+cache capacity"
The simple expression is: IC "XX, X, XXX, XX, XX-X", and its hard disk number can be divided into seven parts.
"IC" stands for IBM products.
The two "X's" in the first part indicate the shape and size of the hard disk. "35" means 3.5 inches (88.9 mm) and "25" means 2.5 inches (63.5 mm) hard disk products.
The "X" in the second part represents the height of the hard disk. "L" stands for 1 inch (25.4 mm), "T" stands for 0.49 inch (12.5 mm) and "N" stands for 0.37 inch (9.5 mm) hard disk products.
The three "X's" in the third part represent the capacity of the hard disk, and the unit is GB. For example, "180" means that the capacity of the hard disk is 180GB, and "080" is 80GB.
The two "X's" in the fourth part indicate the type of hard disk interface.
"AV" stands for ATA interface.
"UW" refers to the 68-pin wide Ultra 160 SCSI interface.
"UC" refers to the interface of Ultra 160 SCSI 80-pin SCA.
"XW" stands for Ultra320 SCSI 68-pin wide interface.
"XC" stands for the interface of Ultra320 SCSI 80-pin SCA.
"F2" is the interface of FC-AL-2(2gb).
The two "X's" in the fifth part indicate the model of the hard disk product family. "ER" stands for Deskstar 60GXP series, "VA" stands for Deskstar 120GXP series, and "V2" stands for Deskstar 180GXP series.
The two "X's" in the sixth part indicate the rotational speed of the hard disk, and the unit is RPM//min. 04 is 4200 rpm, 05 is 5400 rpm, 07 is 7200 rpm, 10 is 10000 rpm, 15 is 65438.
The "X" in the seventh part indicates the capacity of hard disk cache, which is enabled from Deskstar 180GXP. "0" means 2MB cache and "1" means 8MB cache. Among them, the cache of 60GB products with one disk is 2MB, the caches of 80GB and 120GB products with two disks are 2MB and 8MB, and the cache of 180GB products with three disks is 8MB. Pay attention to the distinction when purchasing.
Taking the serial number "IC35L 180AVV207- 1" as an example, we can know from the serial number that this hard disk is a 3.5-inch hard disk with a height of 1 inch and a total capacity of 60GB. It is a series product of Deskstar180Xp, with Ultra ATA interface and rotating speed of 7200 RPM/.
Identification method of Hitachi 7K250 series models
Hitachi's 7K250 series is a new product after the launch of Deskstar180Xp. Its performance is better than earlier products, but the hard disk number has also changed, causing confusion. Let's also study the hard disk numbering law of Hitachi 7K250 series.
The serial number of 7K250 series is "HDS+ rotational speed+maximum capacity of series+capacity of this product+code of product series+height of hard disk+interface type+cache".
Simply expressed as: HDS "XX, XX, XX, X, X, XX, X", and the hard disk number can also be divided into eight parts.
"HDS" stands for Hitachi's Deskstar series hard disk products.
The two "X's" in the first part indicate the rotational speed of the hard disk. If labeled as "42", "54", "72", "10" and "15", the rotational speed of this hard disk is 4200 RPM/, 5400 RPM/, 7200 RPM/, 1000 respectively.
The two "X's" in the second part indicate the maximum capacity of this product series, and the unit is GB. "25" means that the maximum capacity of this product is 250GB.
The two "X's" in the third part represent the hard disk capacity in GB or 10GB. For example, "80" means 80GB and "25" means 250GB.
The "X" in the fourth part represents the algebra of the hard disk. Now all the 7K250 series are letters "V".
The "X" in the fifth part indicates the height of the hard disk. This is the same as the IBM number above.
The two "X's" in the sixth part indicate the interface types of the hard disk, including "AT" and "ST". Expressed as Ultra ATA 100 interface and serial ATA 150 interface respectively.
The "X" in the seventh part represents the capacity of hard disk cache, and the numbers are "2" and "8". Hard disk products representing 2MB cache and 8MB cache respectively.
The "X" in the eighth part is the reserved value of the hard disk, which is the number "0" for the time being.
Take the hard disk number "HDS722525VLAT80" of Hitachi 7K250 series as an example, we can know that it belongs to a hard disk, with a rotation speed of 7200 RPM/, a maximum capacity of 250GB, a total capacity of 250GB, a height of 1 inch, an ultra ATA interface 100, and an 8MB cache.
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Maituo is an independent subsidiary of Hyundai Electronics.
Maituo is an independent subsidiary of Hyundai Electronics, and 200 1 became famous by acquiring quantum. In the past, the company's products also covered both IDE and SCSI, but due to the lack of competitiveness of SCSI products, it finally gave up this high-end market and focused on IDE hard disks, so Maxtor should be the most exclusive hard disk manufacturer today. As the main energy is concentrated in the field of IDE hard disk, with exclusive advanced technical experience, it has once created brilliance in the retail market of desktop hard disk, so it has a great influence in the retail hard disk market and its product reputation is also very good.
Key skills: Maituo hard disk model identification method
Maxtor's hard disk used to have a 7-digit serial number, but since Diamondmax Plus9, its hard disk serial number has changed to 13. However, what is useful for us to identify the hard disk is the first 7 digits. The number of Maituo is mostly "serial number+maximum capacity of this series of hard disks+first place+capacity+interface type+number of heads".
Our simple expression is "XX, XXX, X, X".
The two "X's" in the first part indicate the product family and model.
"3" is equal to or less than 40GB, and "9" is greater than 40GB. This series is the first generation of star diamonds.
"2R" means fireball 53 1DX, the first generation of American diamonds.
"2B" means fireball 54 1DX American diamond II.
"2F" means fireball 3.
"4W" refers to Diamondmax 536DX Star Diamond II.
"4D", "4K" and "4G" are all represented as Diamondmax 540X star diamond three generations.
"4R" means Diamondmax 16 star diamond four generations.
"5T" stands for the sixth generation of Diamondmax Plus60 gold diamond.
"6L" stands for the seventh generation of Diamondmax Plus D740X gold diamond.
"6E" means diamond plus 8.
"6Y" means diamond plus 9.
The three "X's" in the second part represent the capacity, and the unit is GB. For example, "080" or "200" are expressed as 80GB or 200GB respectively.
The "X" in the third part indicates the buffer capacity, interface and spindle motor type.
"D" refers to Utral ATA/33.
"u" means Utral ATA/66.
"H" stands for Ultra ATA 100 interface with 2MB cache.
"J" stands for Ultra ATA 133 interface, 2MB cache and ball motor.
"L" stands for Ultra ATA 133 interface, 2MB cache, and hydrodynamic bearing motor.
"P" stands for Ultra ATA 133 interface, 8MB cache, and liquid bearing motor.
"M" means serial ATA 150 interface, 8MB cache, using liquid bearing motor.
The "X" in the fourth part indicates the number of magnetic heads used, that is, the number of recording surfaces, so the storage capacity per disk can be calculated by the formula of "storage capacity per disk of hard disk = 2 × total capacity of hard disk/number of magnetic heads". However, since Diamondmax Plus9 of the Diamond Series, the number has changed to "0", but we know that Diamondmax Plus9 of the Diamond Series is based on storing 80GB of products per disc, so the changes here will not affect our recognition.
Let's take Diamondmax Plus9 hard disk with serial number "6Y200M006500A" as an example. We already know that the first seven digits of this number are useful to us, so we see that the capacity of this hard disk is 200GB, serial ATA 150 interface, 8MB cache and liquid bearing motor.
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Western Digital focuses on hard disk brands in OEM market.
Western Digital focused on the OEM market in the early days, mainly supplying some large companies, with little influence in the retail market, and it has been in a tepid and stable state in China. However, with the growth of our domestic consumption, Western Digital began to attach importance to the China market and strive to expand its business in China. Its main products are caviar, protected people and performers. Caviar is the main product in the desktop market, with moderate performance and more advantageous price.
Key Skills: Model Recognition Method of Western Digital Hard Disk
The numbering form of Western Digital varies with product series. The numbering method is simple and clear, and it consists of 12 numbers or letters. 12, the first six numbers are the main numbers, and the last six numbers are the supplementary numbers. The label of its main caviar series in the desktop market is "vendor code+capacity+speed, cache+interface type".
Simply expressed as WD "XXXX, X, X-XX, X, X, XX", it can be divided into seven parts.
"WD" is the abbreviation of "Western Digital", which means that it is a product of Western Digital Company.
Number of top 6 editors:
The four "X's" in the first part represent the hard disk capacity, which usually consists of 3 to 4 digits, and the unit is GB. Its logo is the same as Seagate's, for example, 4-digit "1200" stands for 120GB, and 3-digit "800" stands for 80GB.
The "X" in the second part represents the hard disk speed and cache capacity.
"A" stands for caviar hard disk at 5400 rpm.
"B" means caviar hard disk with a rotation speed of 7200 RPM/.
"E" stands for Protege series hard disk, rotating at 5400 RPM/.
"J" refers to the high-end caviar hard disk with a speed of 7200 RPM/ and a data cache of 8MB.
"G" stands for Raptor series, the highest-end desktop hard disk, 10000 RPM/ and 8MB data cache.
The "X" in the third part indicates the type of interface.
"A" stands for Ultra ATA/66 or earlier interface type.
"b" means Ultra ATA/ 100.
"W" stands for hard disk used in A/V (digital audio and video) field.
"D" stands for serial ATA 150 interface.
The last six additional numbers:
For the last six additional numbers, I'm sorry that I can't find the hard disk additional number data related to the serial ATA 150 interface specification, which is a pity.
The two "X" in the fourth part are OEM customer logos. For Western Digital products now facing the retail market, both numbers are "00". If used as other characters, it is the code of the OEM customer. Different numbers correspond to different OEM customers, and hard disks with this number are usually not oriented to the retail market.
The "X" in the fifth part represents the hard disk storage capacity of each disk, and the unit is GB. "C" stands for 40GB storage per disk, "D" stands for 66GB, and "E" stands for 83GB.
The "X" in the sixth part indicates the version code of the same series of hard disks, and different series are different.
"A" stands for BB series, 7200 rpm, Ultra ATA 100 interface;
"B" stands for 5400 rpm, AB series Ultra ATA66 interface;
"P" stands for EB series, 5400 rpm, Ultra ATA 100 interface;
"R" stands for 7200 rpm, Ultra ATA 100 interface, JB series, 8MB cache.
There are other letters such as "U" and "V" in single-disc 66GB and 83GB products, which correspond to JB series and BB series products respectively.
The two "X's" in the last part indicate the firmware version of the hard disk. At present, we usually use "A0".
Let's take the hard disk number of "WD2500JB-00EVA0" as an example. From the chief editor's number, we can know that this is a hard disk produced by Western Digital Company, with a capacity of 250GB, 7200 rpm and 8MB cache. From the attached figures, we can also see that this product is 83GB from Western Digital, which is used for retail market and storage per disk. In fact, I think for ordinary consumers, buy a western digital hard disk and look at the top six figures to know the performance. Adding the next six additional numbers will make it more difficult.
For the hard disk with serial ATA 150 interface newly developed by Western Digital Company, if the main 6 digits are "WD2500JD", we can know that it is a hard disk with a rotating speed of 7200 RPM/, a data cache of 8MB and a serial ATA 150 interface. Also, the editor number "WD740GD" of Raptor series, the top desktop hard disk of Western Digital Company, also represents most of the information. We can easily see the information that its capacity is 74GB, its rotating speed is 10000 RPM/, its data cache is 8MB, and it adopts serial ATA 150 interface.
Samsung rare metal box packaging service is perfect.
After the storm of hard disk warranty, Samsung held high the banner of three-year warranty and cut into the market. Although it hasn't been in the field of hard disk for a long time, its performance has been relatively stable, and its advantage is better after-sales service. In addition, Samsung's "black box" is encapsulated in a rare metal box. Although this has nothing to do with the quality of the hard disk, it gives people a delicate feeling. Samsung hard disk has advanced liquid bearing motor FDB technology, ImpacGuard shock-proof head, SSB shock-proof shell, noise suppression technology and so on. Improve the comprehensive performance of products.
Key skills Samsung hard disk model identification method
Because the product line needs to be expanded, at present, Samsung hard disks belong to SpinPoint series, which are divided into two categories: P and V, and the numbering form is "series model+speed+capacity+cache+head number+interface type".
We can also simply express it as "x, x, XXX, x, x".
The "X" in the first part indicates the hard disk product family. The "S" here stands for "SpinPoint" series.
The "X" in the second part represents Samsung hard disk products with different rotational speeds.
"V" stands for V-series hard disk, rotating at 5400 RPM/.
"P" stands for P-series hard disk, with a rotating speed of 7200 RPM/.
The three "X's" in the third part indicate the hard disk capacity, usually with 2 to 3 digits, and the unit is GB. "080 or 120" means 80GB or 120GB hard disk products, but if the cache is 8MB, most of their logos will become "08 1 or 12 1".
The "X" in the fourth part represents the number of hard disk heads, and we can also calculate the storage capacity of each disk according to the formula "storage capacity of each hard disk = 2× total capacity of hard disk/number of heads".
The "X" in the fifth part indicates the interface type of the hard disk.
"A" stands for E-IDE/ATA interface.
"s" stands for SCSI 2 interface.
"u" stands for Ultra SCSI interface.
"d" stands for Ultra ATA 66 interface.
"h" stands for Ultra ATA 100 interface.
"n" stands for Ultra ATA 33 interface.
"C" stands for serial ATA 150 interface.
Let's take Samsung's hard disk numbered "SP 16 14C" as an example. We can also see that this is a 7200 rpm P-series hard disk product of SpinPoint family produced by Samsung. The total hard disk capacity is 160GB, the cache capacity is 8MB, and the number of hard disk heads is 4. Serial ATA 150 interface is adopted, and the hard disk is stored by disk.
For various brands and models of hard disks in the market, they all have their own unique technologies and different performances. I hope DIYer can see the truth clearly, see through the essence and find what we need in many products.
Memory discrimination! ! ! ! ! ! ! !
There is a small chip next to modern memory. This is the SPD chip of memory. It is a chip used to record memory parameters. Ordinary personal computers do not have ECC chips.
Look at the memory mainly to see whether the memory has been polished, and observe whether there are oblique stripes on the chip surface and whether the chip surface is white. These are all signs of being polished.
It also depends on whether the production batch number of particles in the memory corresponds to each other one by one. Don't buy different batches of memory.
Because the appearance design of memory products is relatively uniform, counterfeiters are relatively easy to make fakes (except KingMax). For example, Kingston's pride has become a bad anti-counterfeiting technology, and it is more difficult to identify the authenticity of memory through product appearance and packaging. Even the 800 anti-counterfeiting phone has been counterfeited. Friends who often come into contact with counterfeit brands should know that it is difficult to identify the authenticity of products only by experience. There are only two safest ways: buying from a regular product agent; The products are identified by the product identification method provided by the manufacturer, and the 800 anti-counterfeiting telephone is used for inquiry and verification. Because the product agents in different regions are different, this paper will not introduce the product agents, but mainly talk about the identification method and telephone anti-counterfeiting verification method.
There are three main steps to check the authenticity of Kingston's memory. The first step is to check whether the 4-digit number on the PCB is consistent with the product specification label.
The second step is to look at the portrait anti-counterfeiting area on the Kingston model label from another angle [officially called the Guning Kingston portrait anti-counterfeiting area], and its color will be different from different angles.
The third step is to go to the product certification page of Kingston website to verify the product. Check the detailed addresses of other brands. The memory of other brands is basically 800 anti-counterfeiting mobile phones. As mentioned above, brands with relatively low sales volume cannot attract the attention of counterfeiters. Except for a few parallel brands circulating in the market, most brands can let consumers buy with confidence. The products of these brands generally provide 800 free anti-counterfeiting telephones for consumers to inquire, so as to ensure that consumers buy regular products. Therefore, if consumers are not at ease with these products, they may wish to make a phone call at the scene when purchasing. HY loose strips At present, the memory with the most fakes in the memory market is HY loose strips. These products are produced in some small memory assembly plants. At present, most of HY's bulk products are fakes, and few products can really use HY chips. This may be related to the price system of its bulk products. To tell the truth, with the simulation degree of fake HY large-capacity memory, if compared with the original chip, there should be very few consumers who can really identify the authenticity. Because of the long history of counterfeiting, buying HY bulk strips and buying fakes can already be equated. Even some friends know it's a fake HY chip, and they are happy to buy it, because it's cheap and it doesn't make much difference to use. So here, I don't use all the methods to identify fake HY memory chips as before and introduce them to readers. There are various methods here, and readers can find a lot of information on the Internet at will. The question of whether it is worth buying a batch of HY memory chips is not discussed here. In addition, it is worth mentioning that HY memory also has boxed genuine products for sale in the market, but the quantity is really small, and it is rare for memory shopping guides to start from the mass market.
There are too many articles about memory shopping guide, and most of them take overclocking as the main shopping guide idea, but the author thinks that for mass consumers, good quality and low price are still an important factor in purchasing. So I decided to put overclocking in a secondary position. Starting from the basic situation of the market and the concept of mass shopping, a simple product shopping guide is carried out.
Speaking of the basic situation of the memory market, this is related to three issues: product quality, compatibility and after-sales service. The first is the product quality. The memory in computer accessories is one of the lower products in repair rate, which can be seen from the fact that there are a large number of HY fake memories in the market without causing any large-scale maintenance. Therefore, as long as it is a regular manufacturer's product, the quality can be well guaranteed. So the problem of buying quality is very simple, just buy genuine products. Of course, if you really feel risky, you can also buy bulk products, but I don't advocate it.
Second, product compatibility. For many years, memory compatibility has been one of the main considerations for consumers to upgrade their memory, especially at present, dual-channel platforms are popular, and only good memory compatibility can ensure the stable operation of the system. As far as the actual situation of the current market is concerned, generally speaking, as long as the products of the same brand and model are purchased, the compatibility of the products can be well guaranteed. The problem has finally come, which is why I don't recommend buying bulk strips. Many friends have encountered problems after upgrading the platform, and the memory of "same brand and same model" has formed a dual-channel platform. This is because the chips used in this kind of bulk strip are colored. It is not easy to ensure 100% compatibility between bulk strips purchased one year ago and bulk strips purchased one year later. Therefore, based on this, the advantages of purchasing branded memory are more obvious. Kingston, for example, promises 100% compatibility and enjoys a good reputation in the market. (of course, it is also plagued by fakes. )
Finally, after-sales service. Although the memory produced by regular manufacturers is very low in repair rate, they are not afraid of 10,000 yuan, just in case. Not every consumer is so lucky. After memory problems, they can only seek after-sales service. At present, the warranty schemes of major memory manufacturers are different, including one-year replacement, three-year warranty, or final warranty and other after-sales service commitments. For these promises, we must see whether the market channels of their products are perfect. Generally speaking, perfect market channels ensure that after the products are sold, the final retailers or agents can quickly fulfill their after-sales service commitments. In this regard, we can know the popularity of the brand products in the market and whether there are regular agents in the local area. This is a little fuzzy. A simple way is not to buy memory at small counters. Friends in the industry know that the "counter owners" of these counters can have "three changes" a year. Even if you can find a general agent to guarantee you, this process will increase your trouble.
Finally, talk about whether to buy memory from memory performance. As a DIYer, I also pursued memory parameters for a period of time. But for mass consumers, what are the real meanings of the four parameters of memory? Here, the author can't conclude that it is meaningless. Even so, I know that memory capacity and price are two factors that mass consumers care about. In fact, the influence of SPD parameters on the performance of the whole machine is only concerned by enthusiasts. Therefore, ordinary consumers with high SPD parameters can ignore it, especially those so-called overclocking products. It is far from important to spend more money to increase the memory capacity. This is also a practical truth in the market: "Don't buy expensive ones, just buy suitable ones".
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