Shutdown behavior and flash storage devices

From	Dave Nadler <drn@nadler.com>
Newsgroups	comp.arch.embedded
Subject	Shutdown behavior and flash storage devices
Date	2021-07-24 11:19 -0400
Organization	Aioe.org NNTP Server
Message-ID	<sdhb29$ibh$1@gioia.aioe.org> (permalink)

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Hi All - I'm wondering what other folks do about this issue...

Consumer flash storage devices (USB memory stick, SD card, etc)
have a nice internal wear-leveling controller. When one does a write 
operation, lots of sectors may be internally rejiggered to provide 
uniform wear (so things that are never rewritten from the application 
point of view are actually moved around and rewritten). This activity is 
invisible from normal application's point of view, but takes some time. 
If the device is powered off during such activity, data corruption... 
So, its necessary to provide the device some time after the last write 
before it is powered off. Plenty of embedded stuff I've seen too often 
corrupts memory at power off, and of course the device manufacturers 
blame the memory manufacturers...

So, how do you avoid this kind of corruption in your designs?

Thanks,
Best Regards, Dave

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Shutdown behavior and flash storage devices Dave Nadler <drn@nadler.com> - 2021-07-24 11:19 -0400
  Re: Shutdown behavior and flash storage devices Theo <theom+news@chiark.greenend.org.uk> - 2021-07-24 16:37 +0100
  Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-24 18:10 -0700
    Re: Shutdown behavior and flash storage devices Dimiter_Popoff <dp@tgi-sci.com> - 2021-07-25 14:18 +0300
      Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-25 09:20 -0700
    Re: Shutdown behavior and flash storage devices Dave Nadler <drn@nadler.com> - 2021-07-25 08:49 -0400
      Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-25 09:30 -0700
      Re: Shutdown behavior and flash storage devices Dimiter_Popoff <dp@tgi-sci.com> - 2021-07-25 22:51 +0300
        Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-25 13:27 -0700
          Re: Shutdown behavior and flash storage devices Dimiter_Popoff <dp@tgi-sci.com> - 2021-07-26 00:00 +0300
            Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-25 17:35 -0700
  Re: Shutdown behavior and flash storage devices kegs@provalid.com (Kent Dickey) - 2021-07-25 13:53 -0500
    Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-25 13:20 -0700
  Re: Shutdown behavior and flash storage devices Jaded Hobo <badboy@heaven.org> - 2021-07-27 19:44 +0200
    Re: Shutdown behavior and flash storage devices Don Y <blockedofcourse@foo.invalid> - 2021-07-27 11:27 -0700

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