Solid-state disk (IDE flash disk, serial ATA flash disk) is composed of control unit and storage unit (flash memory chip), which is simply a hard disk made of solid-state electronic memory chip array (the current maximum capacity is 4 16GB). The interface specification, definition, function and usage of solid-state hard disk are exactly the same as those of ordinary hard disk, and the product shape and size are also exactly the same as those of ordinary hard disk, including 3.5 ",2.5", 1.8 "and other types. Because the solid-state hard disk has no rotating medium of ordinary hard disk, it has excellent seismic performance and wide working temperature. The electronic hard disk with extended temperature can work at -45℃ ~+85℃. Widely used in military, vehicle, industrial control, video monitoring, network monitoring, network terminals, electric power, medical care, aviation, navigation equipment and other fields.
Generally speaking, the current hard disks (ATA or SATA) are disk-type, and the data is stored in disk sectors. Solid-state hard disk is made of flash disk (that is, memory, mp3, U disk and other storage media), which is no different from traditional hard disk in appearance. Solid state hard disk is the development trend of hard disk in the future. At present, Samsung and other manufacturers have released a variety of SSDs, among which Yu Zhan's latest product, the high-speed SATA SSD developed with a single control chip, has a maximum continuous access speed of 200 MB/ s and a capacity of 128GB, which is 2~3 times faster than the SATA interface SSD with a continuous access speed of about 50 ~ 60MB/ s on the market! However, at present, the price of SSD is still high, and it has not yet spread to DIY market.
Classification 1. SSD based on flash memory uses flash memory chip as storage medium, which is what we usually call SSD. Its appearance can be made into various shapes, such as notebook hard disk, micro hard disk, memory card, U disk and so on. The biggest advantage of this SSD is that it can be moved, data protection is not controlled by power supply, and it can adapt to various environments, but its service life is not high and it is suitable for individual users.
2. SSD based on DRAM: DRAM is used as the storage medium, and its application range is narrow at present. It imitates the design of traditional hard disk, can be set and managed by file system tools of most operating systems, and provides industrial standard PCI and FC interfaces for connecting hosts or servers. The application mode can be divided into SSD hard disk and SSD hard disk array. It is a high-performance memory with long service life. The fly in the ointment is that it needs an independent power supply to protect data security.
Entering the World of Solid-state Drives Solid-state Drives are a major focus in the storage industry recently, but what we usually see is either a closed whole hard drive or a NAND flash memory chip. Do you want to see what's inside the SSD?
BitMicro Networks, a professional SSD manufacturer, gave us such an opportunity at CES 2008:
Isn't it spectacular? This is a professional-grade solid-state disk product of BitMicro, which uses SCSI interface, and 32 NAND flash memory chips encapsulated by TSOP are densely and neatly arranged on a PCB board-in fact, due to the support of the architecture, there can be more than one PCB board, that is, 64 chips are not a problem.
Unfortunately, we only know that these NAND flash memory chips are Toshiba's, and we don't know the specific capacity, so we don't know how big the whole SSD is.
However, BitMicro revealed a little news about the price, that is, the average cost per GB is about 10, which is about five times that of mainstream mechanical hard disks.
Advantages of SSD storage media SSD storage media can be divided into two types, one is to use flash memory chips as storage media, and the other is to use DRAM as storage media. Solid-state hard disk using FLASH chip as storage medium can be widely used in notebook hard disk, memory card, U disk and so on. The other is SSD using DRAM as storage medium, which has a narrow application range at present. It imitates the design of traditional hard disk, can be set and managed by file system tools of most operating systems, and provides industrial standard PCI and FC interfaces for connecting hosts or servers. The biggest advantage of using FLASH chip to make solid-state memory is that it can be moved, data protection is not controlled by power supply, and it can adapt to various environments, but its service life is not high and it is suitable for individual users.
SSD solid-state memory has the following advantages:
First, the data access speed is fast. According to related tests, under the same computer configuration, it only takes 18 seconds for a notebook with SSD solid-state memory to appear on the desktop, while it takes 3 1 second for a notebook with traditional hard disk, almost half the difference. Secondly, earthquake resistance and fall resistance is one of the characteristics of SSD. Because all flash memory chips are used, there are no mechanical parts in the solid-state memory of SSD, so even if it moves at high speed or even falls over, it will not affect the normal use, and the possibility of data loss can be minimized when the notebook computer accidentally falls or collides with hard objects. Third, the solid-state memory is quiet when working (there is no mechanical motor and fan in the solid-state memory, so the noise value is 0 dB when working), with low calorific value and fast heat dissipation. Fourth, solid-state memory is lighter. Compared with the conventional 1.8 inch hard disk, it is 20-30g lighter, and the reduced weight is beneficial to the carrying of mobile devices.
SSD solid-state memory can't have both. The disadvantage of solid-state memory lies in the recoverability of data. Once the hardware is damaged, if it is a traditional disk or tape storage method, some data may be saved through data recovery. But if it is solid-state storage, once the chip is damaged, it is almost impossible to retrieve the data in the chip that is broken into several petals or broken by current. Of course, this deficiency can also be made up by sacrificing storage space. The principle of backup mainly realized by RAID 1 is the same as that of traditional storage backup. Because the cost of SSD is very high at present, this way of backup is still relatively expensive.
Sandisk 64GB SSD 2007 1 month, Sandisk released its own 1.8-inch 32GB SSD product, and continued to release the 2.5-inch 32GB model in March. Unlike many manufacturers' paper release policies on SSDs, in April, Dell added SanDisk UATA 5000 series 1.8 inch SSDs to the notebook configuration selection of Latitude D420 and D620 ATG.
SanDisk went on, doubling the capacity of two SSDs, and introduced 64GB products of 1.8 inch UATA 5000 and 2.5 inch SATA 5000 series respectively. The average trouble-free running time of the two SSDs is 2 million hours, the average reading speed is 67MB/s, and the standby/running power consumption is only 0.4/1.0w. ..
SanDisk's two new products will begin to provide engineering samples in the third quarter and put into mass production before the end of the year.
Transcend SSD, a well-known storage product manufacturer, has recently introduced several brand-new SSD SSDs, which are designed with 2.5-inch standard specifications and ExpressCard/34 interfaces, mainly to meet the needs of users. The design of the new innovative SSD solid state drive is very good, with high toughness and low weight external protective box, and the capacity has reached the mainstream 32GB. Of course, ultra-low power consumption is also one of their selling points.
Since it is a new SSD solid state drive, its performance is definitely better. It is found that the data reading speed of the new SSD solid state drive reaches 30MB per second, and the data delay response time is much lower than that of the ordinary SSD solid state drive, and ECC memory error correction technology is added to ensure the security and stability of data transmission to the greatest extent. Chuangjian said that these SSD solid state drives have provided a quality guarantee for two years, and a larger 64GB version will meet us soon.
With the active participation of major manufacturers, the popularity of SSD will accelerate in 2008, but there is still a long way to go before it is truly universal. After all, the current capacity of desktop HDD has exceeded 1tb, and the price is very reasonable. SSD SSD will only appear in high-end notebooks and has long been a toy in the hands of some enthusiasts.
Yizheng SSD solid state drive With the emergence of the first solid state drive with independent intellectual property rights in China, its manufacturer Yizheng Storage Technology Co., Ltd. surfaced. In the face of such a little-known enterprise, what is unique about its SSD? How do more than ten world-class patented technologies they applied for improve product performance?
Looking back, the development of SSD began in early 2006. From the beginning, SSD was positioned as an alternative product to the traditional mechanical hard disk (HDD), so from the beginning, technical objectives were put forward, and the continuous reading and writing speed must be higher than HDD. The patented technology of multi-dimensional NAND flash memory array control independently developed by Yizheng can make solid-state hard disk get high bandwidth and high IO processing capacity at the same time. With the help of 16m byte DRAM cache and cache strategy optimized for NAND flash memory, the write performance and efficiency of Yizheng high-speed SSD are improved, which truly exceeds the performance, reliability and life of SSD.
In error correction, power management and bad block management, Yizheng relies on its own technical strength to ensure the characteristics of Yizheng solid-state hard disk, such as strong error correction ability, safe data storage, low power consumption and long life.
It can be seen that Yizheng high-speed SSD can not only solve the problems of traditional electromechanical HDD, but also strengthen the functional indicators of the system.
At present, Yizheng's high-speed SSD has completed the first stage of development, and its SSD products have achieved very high performance, which is at the leading level in the world and has already started to be sold. (Most companies that claim to own high-speed SSD products are still in the lab. )
Yizheng's current product development and production are divided into four stages:
The main flash memory specification adopted in the first stage is SLC (Single Layer Cell).
In the second stage, MLC (Multilayer Cell) FLASH is used as the medium. At present, SLC is about four times more expensive than MLC, so using MLC as SSD will be the mainstream of future business, and MLC is much worse than SLC in performance and reliability, which puts forward higher technical requirements for new SSD technology. At present, the speed of recalling SSD using MLC FLASH can reach 80M/S, and the production work is in full swing.
The third stage is mainly the development of IC. At present, various materials are being prepared, and it is expected to be developed and produced in 2008. After IC is developed, it will have greater advantages in power consumption, cost and volume.
The fourth stage is to apply IC to different fields or develop different application functions, or even develop some.
Specialty.
As a high-tech enterprise established in 2006, E-Easy is devoting itself to the research and development of SSD series products with full enthusiasm, hoping to lead the world's advanced level and make a contribution to the storage industry in China. SSD technology is a brand-new beginning, and there is still a long way to go in the future. Yizheng people will shoulder this burden and make continuous efforts to lead SSD technology to the end.
We expect it to develop faster solid state drives.
Calculated by the annual price drop of flash memory as high as 50%, by 20 10, solid-state hard disk is expected to replace traditional hard disk and become the medium for storing data, the manufacturer said.
Yu Zhan, a domestic storage equipment manufacturer, and Samsung, an international memory manufacturer, jointly released the development trend of solid-state hard drives, indicating that the performance of solid-state hard drives is better than traditional hard drives in terms of power saving and efficiency, and the crux of the former's failure to shine in the storage media market is only the cost, said Do Geun Kim, a senior manager of Samsung. However, it is predicted that by the end of 2009 and the beginning of 20 10, SSD will be expected to encroach on the hard disk market with the capacity below 60GB.
Although 60GB is already the entry-level storage capacity in the notebook computer market, Samsung believes that there is still a lot of room for development in other markets, such as UMPC, 100 yuan computers and portable multimedia players. According to Samsung's forecast, the market penetration rate of SSD in mobile devices will increase from the current 1.32% to 18.82% in 2009. The number of people increased from 8.4 million to 3.256 billion.
Lin Zhiliang, product manager of Yuzhan Technology, said that the reason is the cost reduction. He pointed out that the current price of SSD 1GB is about 12 USD; However, under the trend that the storage density of flash memory is increasing by 2 times every year and the price is decreasing by 50% every year, the unit price of 60GB SSD can be expected to be close to that of traditional HDD with the same capacity, that is, the price per 1gb 1usd.
"Although the price of traditional hard disks will drop every year, no matter how the price of hard disks drops, there will be a fixed cost," Lin Zhiliang said.
However, hard disk manufacturers do not agree with the flash camp. Cai Zhengping, assistant technical support manager of Hitachi, pointed out that flash memory is indeed a threat in the one-inch hard disk market. But computer users are after large capacity. "Solid state drives will not replace traditional hard drives for at least five years," Cai Zhengping said.
Solid-state hard disk, commonly known as flash hard disk, based on NAND Flash, simulates the basic access mode of dynamic random access memory (DRAM) and can realize high-speed data random access transmission. Simply put, the reading speed of SSD is as high as 53 MB per second and the writing speed is 28 MB per second, which are 300% and 150% faster than the standard hard disk respectively. The power saving benefit is 10% to 20%.
Despite this advantage, the unit price of flash memory is still very high. In addition, the ability to control the matching between chips and storage particles and high-speed transmission has not yet reached the commercialization stage. Therefore, although it includes several manufacturers such as Yu Zhan, Samsung, SanDisk, transliteration, etc. It is expected that in early June, that is, from the second quarter of this year, the mass production of solid state drives with a listed capacity of 32GB will begin. Before the end of this year, 64GB and 128GB SSDs are also expected to appear in the market, but in terms of market acceptance, 4GB and 8GB SSDs are still the main products, Lin Zhiliang said. At present, SSD is not a storage medium, which is similar to the memory acceleration technologies of Microsoft and Intel, such as Ready Boost and Turbo Memory.
However, the market has always been optimistic about the future of SSD. SanDisk quoted Gartner's forecast that the global consumption of built-in solid-state hard disks for home and business notebooks will rapidly climb from about 4 million in 2007 to 32 million in 20 10.
Continue to post (forgive me):
With the cheaper flash memory products and the progress of flash memory technology, SSD solid state drives have gradually entered our lives from the original high position. The introduction of ASUS Eee PC, Apple MacBook air, Thinkpad X300 and other notebooks has strengthened the gradual popularization of solid state drives.
So, what exactly is a solid state drive?
Solid-state hard disk, commonly known as flash hard disk, based on NAND Flash, simulates the basic access mode of dynamic random access memory (DRAM) and can realize high-speed data random access transmission. Simply put, it is a hard disk made of solid-state electronic memory chip array (the current maximum capacity is 4 16GB). The interface specification, definition, function and usage of solid state hard disk are exactly the same as those of ordinary hard disk, and the appearance and size of products are also exactly the same as those of ordinary hard disk, including 3.5 ",2.5" and 1.8 ".
Because the solid-state hard disk has no rotating medium of ordinary hard disk, it has excellent seismic performance and wide working temperature. The electronic hard disk with extended temperature can work at -45℃ ~+85℃. Widely used in military, vehicle, industrial control, video monitoring, network monitoring, network terminals, electric power, medical care, aviation, navigation equipment and other fields.
Generally speaking, the current hard disks (ATA or SATA) are disk-type, and the data is stored in disk sectors. Solid-state hard disk is made of flash disk (that is, memory, mp3, U disk and other storage media).
At present, Samsung and other manufacturers have released a variety of SSDs, among which Yu Zhan's latest product, the high-speed SATA SSD developed with a single control chip, has a maximum continuous access speed of 200 MB/ s and a capacity of 128GB, which is 2~3 times faster than the SATA interface SSD with a continuous access speed of about 50 ~ 60MB/ s on the market! However, at present, the price of SSD is still high, and it has not yet spread to DIY market.
There are two kinds of storage media for SSD, one is flash memory chip and the other is DRAM. Solid-state hard disk using FLASH chip as storage medium can be widely used in notebook hard disk, memory card, U disk and so on. The other is SSD using DRAM as storage medium, which has a narrow application range at present. It imitates the design of traditional hard disk, can be set and managed by file system tools of most operating systems, and provides industrial standard PCI and FC interfaces for connecting hosts or servers. The biggest advantage of using FLASH chip to make solid-state memory is that it can be moved, data protection is not controlled by power supply, and it can adapt to various environments, but its service life is not high and it is suitable for individual users.
SSD solid-state memory has the following advantages:
First, the data access speed is fast. According to related tests, under the same computer configuration, it only takes 18 seconds for a notebook with SSD solid-state memory to appear on the desktop, while it takes 3 1 second for a notebook with traditional hard disk, almost half the difference.
Secondly, earthquake resistance and fall resistance is one of the characteristics of SSD. Because all flash memory chips are used, there are no mechanical parts in the solid-state memory of SSD, so even if it moves at high speed or even falls over, it will not affect the normal use, and the possibility of data loss can be minimized when the notebook computer accidentally falls or collides with hard objects.
Thirdly, solid-state memory is silent when working (there is no mechanical motor and fan in solid-state memory, so the noise value is 0 dB when working), with low calorific value and fast heat dissipation. Fourth, solid-state memory is lighter. Compared with the conventional 1.8 inch hard disk, it is 20-30g lighter, and the reduced weight is beneficial to the carrying of mobile devices.
Disadvantages of SSD solid-state memory:
The disadvantage of solid-state memory lies in the recoverability of data. Once the hardware is damaged, if it is a traditional disk or tape storage method, some data may be saved through data recovery. But if it is solid-state storage, once the chip is damaged, it is almost impossible to retrieve the data in the chip that is broken into several petals or broken by current. Of course, this deficiency can also be made up by sacrificing storage space. The principle of backup mainly realized by RAID 1 is the same as that of traditional storage backup. However, due to the high cost of SSD at present, this way of backup will further strengthen the product cost.
Official view:
Yu Zhan, a domestic storage equipment manufacturer, and Samsung, an international memory manufacturer, jointly released the development trend of solid state hard disk (SSD).
Do Geun Kim, senior manager of Samsung, said: The performance of SSD is better than that of traditional HDD in terms of power saving and efficiency. The crux of the former's failure to shine in the storage media market is only the cost. However, it is predicted that by the end of 2009 and the beginning of 20 10, SSD will be expected to encroach on the hard disk market with the capacity below 60GB.
Although 60GB is already the entry-level storage capacity in the notebook computer market, Samsung believes that there is still a lot of room for development in other markets, such as UMPC, 100 yuan computers and portable multimedia players. According to Samsung's forecast, the market penetration rate of SSD in mobile devices will increase from the current 1.32% to 18.82% in 2009. The number of people increased from 8.4 million to 3.256 billion.
At the same time, Cai Zhengping, assistant technical support manager of Hitachi, also pointed out that in the one-inch hard disk market, flash memory is indeed threatening. But computer users are after large capacity. "Solid state drives will not replace traditional hard drives for at least five years.
Bian Xiao's point of view:
Whether it is a traditional hard disk manufacturer or a manufacturer committed to the research and development of emerging SSD hard disks, it is undeniable that solid-state hard disks have advantages over traditional disk hard disks in many aspects. It is believed that with the continuous reduction of the manufacturing cost of flash memory products, one day the solid-state hard disk will completely replace the current disk hard disk.