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posted by martyb on Sunday May 10 2015, @10:37PM   Printer-friendly
from the powerlessness dept.

An SSD stored without power can start to lose data in as little as a single week on the shelf, depending on several factors. When most drives storage were mechanical, there was little chance of data loss or corruption so quickly as long as the environment in the storage enclosure maintained reasonable thresholds. The same is not true for SSDs and the Joint Electron Device Engineering Council (JEDEC), which defines standards for the microelectronics industry including standards for SSDs, shows in a presentation that for every 5 degrees C (9 degrees F) rise in temperature beyond the optimal where the SSD is stored the data retention period is approximately halved.

In a presentation by Alvin Cox on JEDEC's website titled "JEDEC SSD Specifications Explained" [PDF warning], graphs on slide 27 show that for every 5 degrees C (9 degrees F) rise in temperature where the SSD is stored, the retention period is approximately halved. For example, if a client application SSD is stored at 25 degrees C (77 degrees F) it should last about 2 years on the shelf under optimal conditions. If that temperature goes up 5 degrees C, the storage standard drops to 1 year.

[...] When you receive a computer system for storage in legal hold, drive operating and ambient storage temperature are probably not the first things on tap to consider. You cannot control the materials that comprise the drive and the prior use of the drive. You can control the ambient temperature of the storage which will potentially aid in data retention. You can also ensure that power is supplied to the drives while in storage. More importantly, you can control how the actual data is retained.

[...] What started this look into SSDs? An imaging job of a laptop SSD left in storage for well over the 3-month minimum retention period quoted by the manufacturer of the drive before it was turned over to us. This drive had a large number of bad sectors identified during the imaging period. Not knowing the history, I did not consider the possibility of data loss due to the drive being in storage. Later, I learned that the drive was functioning well when it had been placed into storage. When returned to its owner a couple of months after the imaging, the system would not even recognize the drive as a valid boot device. Fortunately, the user data and files were preserved in the drive image that had been taken, thus there was no net loss.

Now imagine a situation in which an SSD was stored in legal hold where the data was no longer available for imaging, much less use in court. Ignorance of the technology is no excuse, and I am sure the opposing counsel would enjoy the opportunity to let the court know of the "negligent" evidence handling in the matter.

 
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  • (Score: 0, Disagree) by Anonymous Coward on Monday May 11 2015, @03:50AM

    by Anonymous Coward on Monday May 11 2015, @03:50AM (#181340)

    Once bitten, twice shy.

    SSD is trash for home use.

    Leave it alone for a week or 2 (vacation), data gone.

    Power cuts out? Data gone?
    Battery dies? Data gone?

    Wrote to much, bricks itself (intel etc).

    Trash.

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  • (Score: 1, Informative) by Anonymous Coward on Monday May 11 2015, @08:51AM

    by Anonymous Coward on Monday May 11 2015, @08:51AM (#181409)

    Just use an SSD to store your operating system (no great loss if no longer readable: just get a new drive and reinstall; not too many writes; big win in speed) and a HDD to store your data (most data doesn't need that much performance anyway; unlikely to die without warning). And of course, have a good backup strategy.

  • (Score: 0) by Anonymous Coward on Monday May 18 2015, @03:50PM

    by Anonymous Coward on Monday May 18 2015, @03:50PM (#184600)

    The assumption that everyone turns off their computer regularly at home seems a bit odd. I'm more likely to turn off the computer in the office quite regularly than I am to turn off my home desktop for even 10 minutes every few months. Also, using ANY hard drive in your computer without having the data backed up on a suitable backup solution (read: something OTHER than an SSD, stored separately) has always been a poor choice. While this information is useful to be aware of, I don't see it being any reason to get rid of the SSD system drive I've got in the desktop I keep on 24/7. As for portable devices, the gains of an SSD are even higher, with lower electricity demands coupled with speed (often necessary on the go). That they can't provide all of these gains AND be a good archival medium is hardly damning; it's just a matter of certain features coming at the cost of others, which is pretty standard with most any technology.