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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: 1, Interesting) by Anonymous Coward on Monday May 11 2015, @06:19AM

    by Anonymous Coward on Monday May 11 2015, @06:19AM (#181376)

    First we have the draconian copyright + DMCA BS limbo [1] and now this retention issue...

    1 https://en.wikipedia.org/wiki/Orphan_works [wikipedia.org]

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  • (Score: 1, Insightful) by Anonymous Coward on Monday May 11 2015, @10:17AM

    by Anonymous Coward on Monday May 11 2015, @10:17AM (#181424)

    It is important to lose data so that common people cannot store anything for a long time, and so that history can be re-written by big brother when he feels like it. SSDs losing data, and quality of HDDs going down very fast. It is not a mistake. They wanted it this way. All is going according to plan.

    The establishment would like to see every hard drive connected to a government line 24/7, so they can keep an eye on everyone. If a hard drive goes offline for more than 1 second, it will automatically self-destruct. Suddenly your data is no longer yours.

    I would suggest everyone buy HDDs with platters, and pay well for a high quality product, which will help boost the HDD industry and increase HDD quality. So that we can continue to save OUR data on OUR drives forever.

    • (Score: 2) by zugedneb on Tuesday May 12 2015, @03:40AM

      by zugedneb (4556) on Tuesday May 12 2015, @03:40AM (#181783)

      ...why not just forget shit and restart?
      I mean, write some poetry, or music that is not very close to what others have written...
      Also, what will happen when our life expectancy comes to 500 years? And after?
      Why store anything? Why not just "sit down" and find the moment again?

      About rewriting history, it is always like that...
      As example, in the archives concerning what led to WW2: what is actually true? What has been rewritten?
      Are you certain there is no lab with the purpose of making paper after old formulas? And ink?
      Once history has become rewritten, many others will stand up for it:
      -some do it for the game
      -some for the humiliation of others
      -jome for the economical benefits
      -some for fear of retaliation
      -and so forth...

      --
      old saying: "a troll is a window into the soul of humanity" + also: https://en.wikipedia.org/wiki/Operation_Ajax