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SSD purchase guide!
DATE:2015-6-11 15:48:16

固态硬盘大降价中,SSD选购指南!

Recently, the major electricity suppliers price cuts, a wave of electricity, solid hard drive in the first half of the time, the time to cut prices, is the time to give yourself a piece of SSD to enhance the operating experience of the computer!
So, SSD in the end how to choose? Please follow me.
1、flash memory (50% of the performance)
MLC TLC SLC
For example, I'd like to deposit a decimal number 3141592653589793:

In SLC is binary 0011000010100010 0101011011010010 0001

固态硬盘大降价中,SSD选购指南!

In MLC for four 1112310201 2302211003002202

固态硬盘大降价中,SSD选购指南!

In the TLC for 131224141211266441 octal

固态硬盘大降价中,SSD选购指南!

Please try to read the raw data with the naked eye.. SLC directly identify black and white can be the most rapid. For MLC, the naked eye can distinguish 0123. For the TLC, but also very difficult to read. Human eye like this, flash memory is the same. The current value in the TLC is difficult to read accurately, and a lot of redundancy is needed to avoid the error.. In breakthrough technology before TLC is really doesn't make any sense, cost although to save one-third, but performance and life are poor three times, but also paid greater redundancy cost is simply not worth the candle.
Performance SLC>MLC>TLC
Life SLC>MLC>TLC
Price SLC>MLC>TLC
To sum it down is a penny of the goods
SLC generally recognized 100000 P/E (programmed / erased). Now only the server and a certain number of U disk (personal not recommended) in use, the price is expensive. It's hard to see this thing in practice..
MLC was born as controversial as TLC today, but it has withstood the test of the market as the absolute mainstream, P/E 3000-5000 with 5 years of little.
TLC originally only in the low-end U disk and storage card, 1000 P/E for the life of the U disc is not the problem, the general has not been exhausted and so on have been lost. Now Samsung should let it appear on SSD, become frenzied!

Solid state hard disk big price cuts, SSD purchase guide!

固态硬盘大降价中,SSD选购指南!

Typical pit dad products: 840/850 EVO Samsung
SSD this thing with TLC particles, the whole industry is relatively cautious, only Samsung 3bit MLC sold in claiming to put up a pageantry. Arguably TLC can reduce the cost, but the actual situation is Samsung have its equipped with higher performance of main control to recover part of the speed, and always pit white pricing strategy, price 840/850 Evo than MLC mainstream products is also expensive. Although Samsung has insisted that its own 3D stacked TLC particles of the higher than MLC, but the total amount of the warranty limit from the point of view, but also the level of 1000P/E only.

固态硬盘大降价中,SSD选购指南!

Memory card
The memory card is no master, no balance wear function (so don't format it NTFS format!) , that is, the performance and life of the whole particle. Now on the market the vast most of the storage card is TLC particles, only a small part of flagship SD / TF using MLC particles, such products generally capacity for 64GB, marked 600X or nominal write more than 80mb of speed, of course, the price is not cheap.
U disk
The U disk is not completely fall to the TLC particles, such as the SanDisk CZ80 is the MLC particle +SSD master control bridge USB3.0 artifact. Note that the U disk and SSD like there are read and write speed and capacity is proportional to the situation, so if you do not bad money or to buy large versions of the capacity.
Process
The more advanced the process, the thinner the oxide insulation layer of the storage unit, the faster the loss, the shorter the lifetime.. Now with the progress of the process, the capacity of a single particle is growing, the unit price is getting cheaper, while the life will shrink. Therefore, the solid-state hard disk and other electronic products, is to buy the old not buy new.
Typical pit dad products: MX100 Crucial
M550 and mx100 are brothers of the same master, using the same Marvel9189 master. The only difference is m550 using old 20 nm particles and mx100 using new 16nm particle. So the performance of the MX100 is slightly weaker than the M550, and the service life is shorter and the price is slightly cheaper.. Overall, no M550 cost-effective.
Synchronous / asynchronous
Now market the flash memory has two types of standard, a class is Samsung, Toshiba, flash Di dominated the toggle standard, a class is Intel, micron and Hynix leading ONFI standard. In the latest version of the standard, the bandwidth of 400MB/s is Toggle. While ONFI is divided into synchronous and asynchronous mode, the bandwidth of synchronous mode is 400MB/s, and the bandwidth of asynchronous mode is only 50MB/s.
In the actual production process, the particles simultaneous and asynchronous particles from the same production line, after testing to particles with the high-speed synchronous mode and stable operation will be classified as asynchronous sold cheap particle. This and Intel to the defect i7 shield two core into I3 is a reason.

Typical pit dad products: SSDNow V300 Kingston

固态硬盘大降价中,SSD选购指南!

Kingston to media to send a measured products is Toshiba particles and later released version but muffled fortune for asynchronous particles of micron, performance plummeted, even is CZ80 U disk operations. Many domestic brands more than gold shit meal is bad, when sent to test is positive, the sale later replaced the white sheet. So if you do not buy the regular brand. We must pay attention to whether the manufacturer of substitution.
2master (accounting for 40%)
Compression / non compression
Now the mainstream products in addition to Samsung will fall Marvell uncompressed master. The compression of SandForce in theory can reduce the flash write amount and prolong the life.. In actual use, 4K write this index is very powerful, but too horrible to look at other parameters. This is the most significant for enterprise database. But the home is a tragedy.
Typical pit father products: SF master is the pit father products.
Cache
If you think that the solid hard disk cache is used to do data buffer that you too naive. Its important role is to store the FTL Layer Flash (Translation).. FTL as the intermediate layer between the logic disk and physical chip to establish mapping relationship between the old block, the balance wear and so on a series of functions. With the mechanical hard disk look track, the SSD read do not know where the file exists which flash memory location, you must read the FTL table to obtain the true location of the data. The function of the cache is to store the FTL table, thus greatly improving the reading performance of SSD. The bigger the disk space, the bigger the mapping table is, the greater the need to be equipped with the cache. SandForce master as well as some of the domestic cottage disc cache, read the level can be imagined.
Typical pit dad products: no cache is the pit father products.
CE quantity
The internal of the solid hard disk can be seen as an Raid0 array of flash memory (which is actually more complex than the Raid0, for easy understanding).. CE number = total number of chip packages = total capacity / particle size. So the more SSD capacity, the faster the parallel read and write. These days don't buy 128GB SSD, 256gb is standard, spend twice as much money, double the speed, capacity is doubled, double the service life, can be described as a trifecta.
M500 120GB Crucial typical pit dad products
M500 uses is 128GB particles, is only 8 of 120GB version of CE, the 9187 master is access to 32 Ce (8 channels, play the best speed per channel 4CE) can, therefore 120GB version of the write performance really is horrible, till the 480gb full of blood. In contrast, the M550 version of the low 64Gb particles, 128GB version of the speed is also quite good, 256GB direct full blood.
3firmware (10%)
The firmware are icing on the cake, such as the M5P year after the firmware upgrade 4K exceeded 100000 mark. Of course, there are pit father, such as CrucialM500 in order to guarantee the stability of deliberately high speed limit. Such as M5S Plextor and M5P with the same master and particle, but Plextor deliberately used different firmware to distinguish between the two. There are a lot of small partners remember 82ES 2B with CASIO pencil hard to change 991ES, it is the case.

4recommended products

固态硬盘大降价中,SSD选购指南!

Limit stability Intel 730
Intel 730 is the product of enterprise castration solid particles with Intel, produced the pursuit of stability is preferred. The stability here is not just tens of thousands of hours without the stability of the failure, but the consistency of the performance, that is, the performance of a long time will not fluctuate. Note that the other low-end models such as Intel 520/530 SandForce master therefore does not recommend.
Limit speed Pro/SanDisk 840 Extreme Pro Samsung
Samsung's flagship product is really excellent, but the mainstream product prices very pit, the low-end product performance is very slag. The rumors of the new TLC 850Pro simulation MLC is inconclusive. But the old 840Pro almost perfect tough performance is indeed obvious, the rich handsome while now there is a piece of inventory.
SanDisk's flagship product is very good, whether it is SSD, U disk or memory card, as long as ExtremePro is a symbol of performance. At the same time, 10 years warranty is a lot of extra points.
Limit price M550 Crucial
The performance of the M550 can barely reach the flagship, while the price is just the mainstream level, is currently a few of the conscience of the product. The new MX200 has begun distribution, particle "upgrade" for 16nm, so take advantage of the old models and hurried into the inventory.
Limit cheap Arc100 OCZ
OCZ before because of the piece of white the brand discredit, is Toshiba after hours launched a bargain Arc100. In general this SSD can be considered Toshiba original factory products, domestic mainstream price cheap, a few days before the Jingdong 240g to 559 yuan. The performance of an excuse.
5do not recommend products
M6S Plextor
Have a look Amazon.com a few comments that Plextor abroad is inferior. My think also know, how could the cost control of assembly plant will be better than the original? M6s on particles on the main control on prices are not as good as m550, but the m5S shrink products actually become a celestial countless cock wire in the eyes of the price, have lamented the navy force.
M6P Plextor
Although the performance of M6P is the flagship level, but is actually M5P changed the tyrant gold shell. Plextor claims that the technology is never quick to set radical garbage recycling strategy in the firmware. The metabolism of the body is shortened, and SSD is the same. Coupled with the M6P just listed on the recall, the stability really make people suspect.
Samsung TLC products
Evo series is really just the tip of the iceberg. Many of the super built a call PM851 SSDs. This is without SLC cached OEM version 840EVO. So if disassemble and replace it or try to change the m550 msata version.
All the products of the Kingston
Kingston SSD commonly known as large U disk, U disk and Kingston did not, who bought who regret.
Cottage brand
White chip for the package after the detection of the performance of the finished product, grinding off the logo sold to the downstream manufacturers. General white film product prices will be surprisingly cheap, speed is also significantly slow. Like what the Adata ah ah ah, GALAXY, Jin Sheng Wei, what, if not white it is odd.
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