SSDs are worth the investment because it has a higher speed than a regular hard drive . But besides that it also has a small problem : as soon as you delete a file on an SSD has TRIM enabled , the data will be gone forever .
Preamble
Have you ever wondered upgraded PC and speed will increase somewhere before? Sure, by increasing the CPU to perform the task more seriously , if you install a wide range of other applications , then almost immediately you will notice the change in speed .
But it appeared SSD , a great invention converge with NAND Flash memory controller ultra fast and efficient on a 2.5- inch casing makes small but even the fastest mechanical hard drives also have to give it . Yes, the SSD will significantly increase PC speed , and honestly , before it hit the market , many people have realized the hard drive has mechanical limitations are.
But there also exists an SSD problem is that it does not really care much for since TRIM was introduced last fall . It has a very small size and great speed , but as that does not mean this is a perfect product .
Reasons to use TRIM , and its disadvantages
When SSD starting to take off , and Intel quickly becoming a developer for the SSD controller , a major flaw was discovered ... the decline rate . Initially it was thought that only the new Intel drives this mistake , but it turns out nearly every model on the market are similar errors .
Nearly all the storage devices that we use every day are processed in a manner similar file . When you delete a file , the URL to which the data contained in the list of storage devices ( LBA at the drive motor ) will be clear . Imagine a list of your favorite films are recorded in seconds . You just burn it off . That list has been lost but the movie is still there . The principle is the same store .
Since the data should remain possible to restore them - at least until the blocks that were overwritten on the new data . Those who accidentally delete the wrong files are very grateful to this mechanism . When SSD appears, data processing mechanism is not changed , but the speed has completed the change process .
Traditional mechanical drive can override the data without affecting the speed . That is why after many years of use , speed is not degraded . But with SSDs , on the other , by the way the NAND Flash memory .
Please review the file fragmentation . As more and more data is written to various blocks on a storage device , such as what data to delete from the same block later , the block will not lose all data .. There may be a 4K block is part of a picture , and some other 4K block is part of a Word document . If you erase that image , then what's left of Word documents remain unchanged .
After a certain period of time , the blocks will fall into disarray , causing reduced speed due to search from many different blocks located in different places . So then we have the cleanup process , ie the data is put into the adjacent block to get it more convenient . But this does not solve the SSD to write large amounts of data over a block .
To perform this procedure , the first SSD to wipe out all data in the block , then new data overwrites up . Compare this process with a mechanical hard drive - just overwrites the old data onto the data . So SSD will experience problems with performance and this is the time needed to TRIM .
Used for the first time in Windows 7 , TRIM is an ATA command entirely new OS for SSDs to perform a certain command such as Delete , Format , or Discard . Very simple but very useful . When you delete a file , or the entire Format SSDs , TRIM will remove all data and links to it , and delete it permanently , simply wipe to switch to a state ready for use .
And this is the beginning of all the trouble. It was once used TRIM , a chance to recover your data has turned into 0 . As mentioned , the data recovery on your hard drive , even SSD TRIM is not enabled , simply . You only need to run a recovery tool that can recover your data , as long as the block is not overwritten after deletion .
Is important because one of us must have also been mistakenly deleted an important file , and then we had to ask for help tools to recover your files . But on SSDs have TRIM enabled , if the file was deleted ( and emptied the Recycle Bin / Trash ) , you will not be able to retrieve the data again .
In fact, the data recovery is almost impossible with a normal user , but with a professional user with the right tools , the job can still be done . In some respects , the same operation as NAND memory ( RAM ) your PC . When a power failure , the data in the memory chip will disappear .
Conclusion
Through testing can be found on the data recovery has enabled TRIM SSD is impossible. Upon executing the command , your data is gone forever . Interestingly, some trace of it remains but the data is not found anywhere . Maybe this is related to the NTFS file system . When Windows formatted drive , it can still retain some portion of the portfolio. But although there are data to list the data is lost .
It is disappointing that so far the company and SSD data recovery company has yet to give us the answer . As if they do not want anyone to know the truth behind TRIM and restoring data , so no one knows how to retrieve deleted data on the drive has TRIM enabled .
This is something that you should be wary TRIM command . Of course TRIM SSD is the only reason that the spleen is a high speed , so even though it is annoying blemishes on but still necessary if you want to always get high speeds on SSD .
So when using TRIM , please pay special attention to the backup . TRIM is not enabled on the drive , if you delete a file , you still have a chance to get it back . But with a drive has TRIM enabled , the file will be gone forever , as well as in RAM so .
But current TRIM only cause problems for some people but later when SSDs become increasingly popular , the people who do not pay attention to his data would have to pay the price . So please be careful and always remember to back up your data !
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