Hi Scott,
Wow, no, I did not see that at all! Sorry for seemingly ignoring you
for days, now. Not sure whether it's my gmail account or something...
Weird. Probably because I messed up my replies in the beginning.
(replying to the points raised in that email since they also answer
your current questions)
Both finished logs showed something interesting, in that there were many small
errors in what could almost be considered a spiral pattern
Yeah, that's pretty much exactly the thing with my drive - it seems
like all bad sectors found are 512 Bytes.
The fun part was that the filesystem (it was an NTFS disk) was so messed up
that nothing would mount it
Maybe I got lucky there since I was using ext3.
even testdisk failed to find a large portion of the files. So be prepared to
use something more robust than testdisk (like R-Studio) if you go through with
the rest of the recovery.
Yeah, that really is the scary part - Since we're talking about 1TB of
DSLR files (.JPG, .MOV) and music (flac, mp3) each, I would really
like to see this mounted. I have 'rescued' a number of disks for other
people and losing all the nice meta-data (directories etc.) would
be... quite a bummer. The music stuff I would probably just have to
redo from my CD collection... *sigh*
ddrutility
>From what I understand that is mostly about your case, rescuing ntfs
partitions? Or would it help in my case as well?
Third, I am interested in a copy of your logfile if possible. Actually I would
like the first one you sent to Antonio if you still have it, and also your
current one.
Sure thing. Will send them along in a separate message.
cheers,
David
On Wed, Feb 5, 2014 at 1:25 AM, Scott Dwyer <address@hidden> wrote:
Hi David,
First, did you see my reply with my 2 cents? It contained some info (my
opinion) as to what might have happened to your drive, and what you might
expect (from my experience). I only replied to the bug list, so if you did
not see it then you will have to look into the archives which can be found
through the ddrescue page.
http://lists.gnu.org/archive/html/bug-ddrescue/
Second, while errors are skipped, every error takes time to process, first
by the drive itself and then that is multiplied by any op system retries
(from what I can tell in linux from observation, it is about 15 retries
normally, or 5 retries using the direct option). So if the drive takes 3
seconds per error, then it would take 15 seconds with the direct option to
process the error, or 45 seconds without the direct option. I used 3 seconds
for the drive as that is about an average from a few drives I have seen, but
that is dependent on the drive itself. Doing a little math on that means
that at 15 seconds per error, you could process about 5760 errors per day.
And you are going to have a LOT of errors by the looks of it, so you are in
for a long recovery. But don't be too discouraged just yet. You will have
many errors spread all over, but there is still a chance that you will end
up with 99% of good sectors vs bad, not to say that file recovery will be
easy when done. What file system is this? Is is NTFS? What type of files
will you be trying to recover?
Third, I am interested in a copy of your logfile if possible. Actually I
would like the first one you sent to Antonio if you still have it, and also
your current one.
Scott
On 2/3/2014 5:00 PM, David Deutsch wrote:
Close to breaking 1750GB, too. I think this kills the "1/8 of the disc
is dead" idea, ie. one platter/side or read head being dead. Still
curious what could produce such a regular error, though. Particularly
across the entire space of the disc. Or maybe I just have no frigging
clue how hard discs werk (I really don't).
Reading still progresses in a steady pace in general, although it's
kind of weird: It only reads every two to three minutes, sometimes up
to ten. Not sure whether that is the drive hardware failing more, in
general (though speeds improving would say otherwise) or just the
general issue with bad sectors. Then again: Shouldn't it just skip
past those? Or are the sectors around the bad ones just hard to get
anything out of?
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