Re: Lock tab on SD card?

From	"Andrew M.A. Cater" <amacater@einval.com>
Newsgroups	linux.debian.user
Subject	Re: Lock tab on SD card?
Date	2021-09-19 14:00 +0200
Message-ID	<CZ3Ed-6Li-7@gated-at.bofh.it> (permalink)
References	<CYMtH-4KS-3@gated-at.bofh.it> <CYNSO-5HI-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sat, Sep 18, 2021 at 03:06:14PM -0400, Dan Ritter wrote:
> John Conover wrote: 
> > 
> > Mounting an SD card with the lock tab enabled mounts as read only.
> > 
> > But can Linux still write to the SD card, under any circumstances?
> 
> Under *any* circumstances? Yes.
> 
> Those circumstances include:
> 
> - a broken lock position sensor on the SD card reader
> 
> - the SD card is actually a microSD card in an adaptor; moving
>   it to a microSD reader or a different adaptor will work
> 
> - the reader has been altered away from spec
> 
> - the lock tab is moved
> 
> Note that Linux needs to remount a read-only filesystem to make
> it read-write.
> 
> Now, what is the problem you are actually trying to solve?
> 
> -dsr-
> 

I'll agree with all Dan has written: there's also the real annoyance and
difficulty that it is small and hard to see and invariably gets locked
when you least expect it and you're trying to work out why you can't copy
a file to an SD card to make it bootable :)

if you're worried about "Can Linux override a physical switch" - the answer
is no, in general terms.

All the very best, as ever,

Andy Cater

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Thread

Lock tab on SD card? conover@rahul.net (John Conover) - 2021-09-18 19:40 +0200
  Re: Lock tab on SD card? David Christensen <dpchrist@holgerdanske.com> - 2021-09-18 20:50 +0200
  Re: Lock tab on SD card? Dan Ritter <dsr@randomstring.org> - 2021-09-18 21:10 +0200
    Re: Lock tab on SD card? "Andrew M.A. Cater" <amacater@einval.com> - 2021-09-19 14:00 +0200

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