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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) by Anonymous Coward on Sunday May 10 2015, @11:12PM

    by Anonymous Coward on Sunday May 10 2015, @11:12PM (#181231)

    Conspiracy from the music industry to punish the file sharers.

  • (Score: 4, Insightful) by anubi on Monday May 11 2015, @05:14AM

    by anubi (2828) on Monday May 11 2015, @05:14AM (#181364) Journal

    Ephemeral media has the opposite effect on me.

    When I "buy" something, yet I can not "own" it, then I quite happily settle for a copy, as I know that is as good as it gets.

    "DVD rot" and unskippable DVD content led me to abandon the concept of buying DVD's, as I saw how my inability to skip content on On The Air TV went, and I was looking to the DVD to spare me from being a captive audience, or force me into caching it on a VCR ( which, thanks to Macrovision, was tricky as well ).

    At least the internet copy is editable, and to me its like the luxury of enjoying pitted olives - where someone else has already addressed the annoyances. I did not know how to bypass copy protection at the time, so a purchased DVD looked to me like a terrible investment. Far better to rent than to buy.

    One must have a super admirable integrity to actually pay extra for an inferior product just to meet someone else's expectations.

    "Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]