SSD(solid state disk)

SSD = solid state disk,SSD drive, with solid state electronics memory chip made hard disk array, widely used in military, automotive, industrial, video monitor network monitor network terminal, electric power, medical, aviation and navigation equipment, etc.

introduction

SSD drive interface standard and definition, function and application method and common hard disk of the same product in shape and size also with ordinary hard disk consistent. The chip working temperature range is very wide (40 ~ 85 ℃). It is used widely in military, automotive, industrial, video monitor network monitor network terminal, electric power, medical, aviation and navigation equipment, etc. Although at present the cost is higher, but also is gradually spread to DIY market.

Due to SSD drive technology with traditional hard disk technology is different, so produced many emerging memory manufacturers. Manufacturers needed to buy NAND memory, coupled with proper control chip, can make SSD drive. The new generation of SSD drive universally adopted SATA - 2 interface.

Edit this paragraph classification

SSD drive the storage medium are divided into two kinds, one kind is to use FLASH FLASH chips) as a storage medium, additionally one kind is to use DRAM as storage media.

Based on the flash of SSD drive

Based on the FLASH of SSD drive (IDE FLASH disk.support, * ATA FLASH disk.support) : use FLASH chips as a storage medium, this is what we say normally SSD 590 series. The look of it can be made into various shape, for example: the notebook hard drive, micro hard disk, memory, etc YouPan style. This SSD 590 series SSD drive the biggest advantage is that it can be moved, and data protection from power control, and suitable to be used in various environment, but use fixed number of year is not high, suitable for individual users. Based on the SSD drive, flash memory storage units and are divided into two kinds: Single Layer Cell performance (SLC) and (MLC unit Cell multilayer Level Multi - units). SLC characteristic is the high cost and the capacity is small, but fast while MLC is characteristic of the large capacity of low cost, but very slowly. Each unit is MLC 2bit relatively and SLC for whole had twice. However, since each MLC storage unit of data storage in a more, structure rather complicated, error increased chance of, must undertake error correction, this movement resulted in its performance substantially behind structure simple SLC flash memory. In addition, SLC flash advantage is autotype number 100,000 times, than MLC flash high 10 times. In addition, in order to guarantee MLC life, control chip calibration and intelligent wear balance, making each technical algorithm of the storage unit write number may average share, achieves 100 thousand hours fault time interval (MTBF).

Based on DRAM of SSD drive

Based on DRAM of SSD drive: adopt DRAM as a storage medium, at present application scope is limited. It follow traditional hard disk design, can be most operating systems of the file system tools for volume Settings and management, and also provides industrial standard PCI and FC interface for connect hosts or server. Application modes can be divided into SSD 590 series hard disk and hard disk array SSD 590 series two kinds. It is a high-performance memory, and use the life is very long. The only fly in the ointment is the need to be independent power to protect data security.

SSD drive advantages

Compared with ordinary hard disk SSD drive, has the following advantages:

Start-up quickly

No motor speed spinning process.

Read delay small

Need not head, randomized fast reading, read the delay is minimal. According to relevant test: two computers on the same computer configurations, carrying SSD drive notebook from boot to appear only 18 SEC desktop altogether, and carrying the traditional hard disk notebook with a total 31 seconds, both almost almost half the gap.

Relatively fixed access time. Because addressing time and data storage position-independent, therefore partition fragmentation will not affect reading time.

Write faster

Based on DRAM of SSD drive write very fast.

noiseless

Because no mechanical motor and fan, when working noise value 0 decibels. Some high-end or large capacity products containing fan, and therefore still can produce noise.

Low calorific value

Low capacity based on flash of SSD drive work in a state of energy consumption and low calorific value, but the high-end or large capacity product energy consumption will be higher.

Don't happen mechanical trouble

Internal does not exist any mechanical moving parts, won't produce mechanical failure, also is not afraid of collision, impact and vibration province electricity

Move. So even in high-speed moving even with flip tilted circumstance also won't affect the normal use, but also on the notebook accident drop or with abvance collision can minimize the possibility of loss of data.

Working temperature range is bigger

The typical hard disk drives only in 5 to 55 ℃ work within. While most SSD drive in - 10 ~ 70 ℃ work, and some industrial-class SSD drive still can be in - 40 ~ 85 ℃, even greater temperature range (um participant: work under RunCore military level product temperature for - 55 ~ 135 ℃).

Small volume weight

Low capacity of SSD drive than with capacity hard disk small volume, light weight. But this advantage with volume increasing gradually diminished. Until 256GB, SSD drive is still better than the same capacity of ordinary hard disk light.

SSD drive faults

Compared with the traditional hard disk SSD drive, has the following weakness:

High cost

Each unit capacity price is traditional hard disk 5 ~ 10 times (based on the flash memory), even 200 ~ 300 times (based on the DRAM).

Capacity is low

Currently SSD drive maximum capacity is far less than traditional hard disk. Traditional hard disk capacity is still in rapid growth, allegedly IBM had been tested 4TB tradition of hard disk.

Vulnerable to the external influence

Because unlike traditional hard disk as shielding on Faraday cage, SSD drive more vulnerable to some external factors adversely affected. If power (based on the SSD drive DRAM particularly), magnetic field interference, antistatic etc.

Write limited life

Write limited life (based on the flash memory). General flash memory write a life expectancy of 1 million to 10 million times, special of up to 100 million to 500 million times, however the entire computer life period portions of the file system (such as file allocation worksheets) write number will still more than this limit. Special file system or firmware can share into place, make the whole life SSD drive up to 20 years.

Data hard to restore

After hard to restore data damage. Once on hardware produces attaint, if is a traditional disk or tape storage mode, through data recovery may also can save a part of data. But if you have a solid storage, one but chip produces attaint, want in the broken into several disc or by the current breakdown of chip retrieves data that is almost impossible. Of course this deficiency is also can sacrifice storage space to compensate, basically use RAID 1 to realize the backup, and traditional store backup same principle. Because the present SSD 590 series of the high cost, use this way backup or the price does not poor.

Battery voyage shorter

According to actual test, use SSD drive laptop computer in spare or low load operation, short on using the battery voyage 5400RPM 2.5 inches traditional hard disk.

High energy

Based on DRAM of SSD drive at any time and energy consumption is higher than the traditional hard disk, especially closed still need the power supply, or data is lost.

Windows XP operating system will probabilistic appear feign death phenomenon

According to the user, the use of MLC reflect SSD drive in a Windows XP operating system will probabilistic appear feign death phenomenon. This is because Windows XP system of the file system mechanism is not suitable for SSD drive. While in Windows 7 SSD drive is optimized, and banned SuperFetch, ReadyBoost and startup and procedures such as prefetching traditional hard drive mechanism, we can better use SSD drive performance.

Development prospect

In early 2008, by research report to 5.85 billion revenue SSD 590 series market, until 2011 time global market will be more than $6 billion had predicted. Enter after 2010, SSD drive will be more attractive, manufacturers and end-users will generate interest about this technology. High-performance disk drives will depart, and SSD drive will eventually replace disk drives, probably in the near future. Mention SSD drive, a lot of people will suddenly thought of familiar with its own advantages and disadvantages. Low power consumption and transmission speed of properties that make it the favor from user deeply, But the price is high, capacity of lower problem is also hinder its marketing popular place. Thus, the SSD drive first enter the enterprise field, 2009 SSD drive in the application of enterprise-level, the first been deployed in the external network storage system.

About SSD drive prospects discussion has become commonplace, everyone was constantly questioned its expensive price may cause the rising costs. But ignores the SSD drive in enterprise applications on the huge advantage, and most of them are in the moonshine has assembled SSD 590 series notebook dominance SSD drive consumption level development.

In fact, we just need to get this account to calculate, can see the price of SSD drive for enterprise-level deployment brought about by the efficient advantages compared too tiny. SSD drive the biggest advantage lies in its storage really fast, than ordinary HDD hard disk around 10 times faster, but also because it USES is the flash memory chip, and completely without using any mechanical motor and fan, so, SSD drive is simply does not exist noise problems. In addition, it also holds concurrently with GCV small, heat faster advantages, can provide the enterprises data center bring stability.