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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: 5, Informative) by kaszz on Monday May 11 2015, @01:01AM

    by kaszz (4211) on Monday May 11 2015, @01:01AM (#181280) Journal

    Formula to predict the phenomena:
    Months before self destruction = 24 * 2^(-(temperature-25)/5))

    temperature in celsius.

    Or inverted:
    Temperature = -log(months/24) / log(2) * 5 + 25

    Thus for 1 month reliability the temperature must be kept below 47 °C.

    Internal heat inside say a laptop should jeopardize the SSD data but as the article says. The phenomena only applies without electricity. But it also means SSDs should not be trusted as reliable storage.

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  • (Score: 0) by Anonymous Coward on Monday May 11 2015, @08:21AM

    by Anonymous Coward on Monday May 11 2015, @08:21AM (#181403)

    Internal heat inside say a laptop should jeopardize the SSD data but as the article says. The phenomena only applies without electricity. But it also means SSDs should not be trusted as reliable storage.

    I think it can apply even if the devices are powered. I doubt all SSDs will refresh/rewrite all data on the SSD. Otherwise the Samsung EVO wouldn't have the problem it has ;). I have one and I workaround it by running DiskFresh every month or so ( http://www.puransoftware.com/DiskFresh.html [puransoftware.com] It's also useful for flaky normal HDDs).

    There's a firmware update for the EVO, but I didn't trust it... Hmm I just checked and looks like I was right to not trust it - the first patch didn't work: http://www.extremetech.com/computing/199673-second-patch-for-ongoing-840-evo-ssd-performance-issues-being-prepped-by-samsung [extremetech.com]

  • (Score: 0) by Anonymous Coward on Monday May 11 2015, @08:27AM

    by Anonymous Coward on Monday May 11 2015, @08:27AM (#181405)

    So the trick for long-time data storage is to put the SSD in the fridge? Or maybe even in the freezer?

    • (Score: 2) by kaszz on Tuesday May 12 2015, @12:10AM

      by kaszz (4211) on Tuesday May 12 2015, @12:10AM (#181709) Journal

      Have an additional platter disk for backup?