Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.sys.ibm.pc.hardware.storage > #5537

Re: "Consumer-grade SSDs actually last a hell of a long time"

Cross-posted to 2 groups.

Show all headers | View raw

On 20/06/2014 13:24, Mark F wrote:
> On Fri, 20 Jun 2014 10:52:40 +0100, Mike Tomlinson
> <mike@jasper.org.uk> wrote:
>
>> In article <3ou2q9p97haauak10o0dj7amk5njr6q2h5@4ax.com>, Mark F
>> <mark53916@gmail.com> writes
>>
>>> Another factor to consider it how long the data is retained;
>>> consider both the case of un referenced data when the power
>>> is on and all data when the power is off.
>>
>> This is actually quite an important question.
>>
>> If data are written to an SSD and that SSD is then unplugged, what is
>> the guaranteed retention time without corruption, of that data?
>>
>> Hard disks are well known to suffer from "bit-rot", but do we have any
>> data on whether it's a problem on SSDs?
> I found various theoretical items using Google that support the idea.
>
> I couldn't find any current articles from flash or SSD manufacturers,
> but in the past I have seen 10 year initial powered down retention
> time and on the same page end of life determined by 1 year un powered
> retention time.
>
> I did find some references from SSD and flash memory:
>
> SanDisk has or had a product with 100 year powered down retention
> time:
>   http://www.sandisk.com/go/preserve/
> the links to details are broken.
>
> SanDisk also has an article with byline NetApp:
>
> http://www.sandisk.com/assets/docs/NetApp%20Write-Intensive%20SSD%20White%20Paper.pdf
> that indicates:
>   Expected lifetime is a calculated number based on both theoretical
> and demonstrated flash endurance limits.
>   "the device still meets its specified error rate after being powered
>    off for three months"
> and mentions refreshing data in the background when power is on.
>
> This is from a user of SSDs (Dell) in a report from 2011:
>
> http://www.dell.com/downloads/global/products/pvaul/en/Solid-State-Drive-FAQ-us.pdf
> that says (on "6 | Page")
>   " 6. I have unplugged my SSD drive and put it into storage. How long
>        can I expect the drive to retain my data without needing to plug
>        the drive back in?
>     NAND Technology Data Retention @ rated P/E cycle
>     SLC             6 Months
>     eMLC            3 months
>     MLC             3 Months
>
>
> After doing these searches today, I agree with
> Yusaf Kahn (6/19/2014 11:40 AM) that SSDs probably have a shorter
> powered down data retention time than flash memory keys {and cameras
> memory cards.)
>
> Also, in 2010 I felt that a new SSD used for backup would probably
> retain memory while powered for more than 5 years, but I think that
> even SSDs that have only been written to a small amount and then
> kept normally powered down should be powered up for a day or so
> every year.
>

Not as long as books, then ;-)

It's kind of ironic that as we move through the most culturally and 
technologically rich period of time (on earth), a good deal of our media 
will, in the not too distant future, be lost. Perhaps.

-- 
Cheers, Rob

Back to comp.sys.ibm.pc.hardware.storage | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

"Consumer-grade SSDs actually last a hell of a long time" Lynn McGuire <lmc@winsim.com> - 2014-06-17 12:04 -0500
  Re: "Consumer-grade SSDs actually last a hell of a long time" "Rod Speed" <rod.speed.aaa@gmail.com> - 2014-06-18 03:39 +1000
    Re: "Consumer-grade SSDs actually last a hell of a long time" Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2014-06-17 16:09 -0400
      Re: "Consumer-grade SSDs actually last a hell of a long time" Mark F <mark53916@gmail.com> - 2014-06-18 07:47 -0400
        Re: "Consumer-grade SSDs actually last a hell of a long time" Mike Tomlinson <mike@jasper.org.uk> - 2014-06-20 10:52 +0100
          Re: "Consumer-grade SSDs actually last a hell of a long time" Mark F <mark53916@gmail.com> - 2014-06-20 08:24 -0400
            Re: "Consumer-grade SSDs actually last a hell of a long time" RJH <patchmoney@gmx.com> - 2014-06-20 13:31 +0100
              Re: "Consumer-grade SSDs actually last a hell of a long time" GB <NOTsomeone@microsoft.com> - 2014-06-20 14:29 +0100
          Re: "Consumer-grade SSDs actually last a hell of a long time" Rob Morley <nospam@ntlworld.com> - 2014-06-20 20:28 +0100
      Re: "Consumer-grade SSDs actually last a hell of a long time" "Rod Speed" <rod.speed.aaa@gmail.com> - 2014-06-20 06:14 +1000
  Re: "Consumer-grade SSDs actually last a hell of a long time" VanguardLH <V@nguard.LH> - 2014-06-17 18:30 -0500
    Re: "Consumer-grade SSDs actually last a hell of a long time" Arno <me@privacy.net> - 2014-06-18 01:51 +0000
  Re: "Consumer-grade SSDs actually last a hell of a long time" Shadow <Sh@dow.br> - 2014-06-18 13:21 -0300
    Re: "Consumer-grade SSDs actually last a hell of a long time" Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2014-06-19 11:40 -0400
      Re: "Consumer-grade SSDs actually last a hell of a long time" Shadow <Sh@dow.br> - 2014-06-19 19:27 -0300

csiph-web