On Thu, Jun 19, 2014 at 10:32 PM, Charles Robinson <charl...@visi.com> wrote:
> A friend of mine has run into an issue where he plugged in his
> write-protected SDXC card to a card reader (on his iPad) and it glitched out.
>
> He has no idea how that happened. He always specifically puts the
> write-protect on before dumping a card, just to be "safe"
A similar thing happened to me on a Lenovo with Linux a few months
ago. I've described this incident on the thread with the subject
`Card failure due to (laptop) card reader [Was: Re: K3 card failure]`
on 30th March.
Other strange card failures have also been reported by others in
threads like: `K3 card failure` on March 3rd.
The common outcome of most: nobody knows exactly what went wrong;
the positive side was that it was an isolated incident, and that some
photos were recovered...
> He is able to use some 'recovery' utilities to pull some not-very-swell JPEGS
> off of the card (not sure if he was shooting some JPG+RAW modes... maybe?)
> but so far nobody and nothing has been able to allow him to recover any
> semblance of the RAW files ( *.ORF ) that are on there.
>
> Does anyone have experience with any sort of recovery utility (he's not
> really concerned with the cost at this point) that could analyze the card
> contents and make any sense of the RAW files that are lost on there somewhere?
My first suggestion (and in general best practice) is to first
create a byte-by-byte clone of the card and try any recovery on that
clone. In fact I would clone the problematic card, then safely store
it for later; then clone the clone once more and do any recovery on
that second clone, thus you can always "retry" the recovery without
touching the original problematic card, which could be damaged further
with any access.
I can't suggest any tools on Windows (there were mentioned some in
the cited threads), but on Linux I suggest (see my thread for
details):
* `ddrescue` for the initial cloning;
* `dd` for subsequent clones;
* `fsck.fat` for first recovery try;
* `testdisk` for more problematic cards;
Hope it helps,
Ciprian.
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