10 days for 7.8gig?

[sean darcy]

I'm running ddrescue 1.9 to rescue a dvd.

It's been running for 10 days!

From in info pages, first I did:

 ddrescue  -n -v  -b2048 /dev/dvd quark.iso logfile


About to copy 7782 MBytes from /dev/dvd to quark.iso
    Starting positions: infile = 0 B,  outfile = 0 B
    Copy block size: 32 hard blocks
Hard block size: 2048 bytes
Max_retries: 0
Direct: no    Sparse: no    Split: no    Truncate: no

Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued:         0 B,  errsize:   8980 kB,  errors:       1
Current status
rescued:         0 B,  errsize:   7782 MB,  current rate:        0 B/s
   ipos:     69632 B,   errors:       1,    average rate:        0 B/s
   opos:     69632 B
Finished

That took about an hour.

Then:

ddrescue  -d -v  -b2048 /dev/dvd quark.iso logfile


About to copy 7782 MBytes from /dev/dvd to quark.iso
    Starting positions: infile = 0 B,  outfile = 0 B
    Copy block size: 32 hard blocks
Hard block size: 2048 bytes
Max_retries: 0
Direct: yes    Sparse: no    Split: yes    Truncate: no

Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued:         0 B,  errsize:   7782 MB,  errors:       1
Current status
rescued:         0 B,  errsize:   7782 MB,  current rate:        0 B/s
   ipos:   226940 kB,   errors:       1,    average rate:        0 B/s
   opos:   226940 kB
Splitting error areas...

This has been running for 10 days. logfile  is now up to 6MB. AFAIC,
ipos/opos keeps going up to 7782 MB, then starts over.

Is this what I should expect? Did I do something wrong?

sean


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[Antonio Diaz Diaz-2]

sean darcy wrote:
>>From in info pages, first I did:
>  ddrescue  -n -v  -b2048 /dev/dvd quark.iso logfile
...
> That took about an hour.

So it took ddrescue only an hour to discover your dvd is totally
illegible. Not bad.


> Then:
> ddrescue  -d -v  -b2048 /dev/dvd quark.iso logfile
...
> This has been running for 10 days. logfile  is now up to 6MB. AFAIC,
> ipos/opos keeps going up to 7782 MB, then starts over.

If left alone, ddrescue will try every sector in the dvd. Given that
this dvd seems totally illegible (ddrescue has rescued nothing yet), and
supposing the reader takes one second to report every bad sector (very
optimistic), ddrescue can be running for 44 days before finishing.

Try to rescue the dvd on another reader and if the first pass rescues
nothing, give up. sorry.


Regards,
Antonio.


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[Olivier Delhomme-2]

2009/1/15 Antonio Diaz Diaz <antonio_diaz@...>:

> Try to rescue the dvd on another reader and if the first pass rescues
> nothing, give up. sorry.

Hello,

I know that I might not tell you to use something else in this list, but,
to recover dvds you might try different drives and also different
software such as dvdisaster (http://dvdisaster.net/en/). You may
try all combinations...

Cheers,

Olivier.


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[Charles Hemingway-2]

Here's what I've done to rescue my son's scratched dvds (*grumble* son,
these discs aren't frisbees!)

DVDs are typically encrypted. This includes the file system on some
(most?) DVDs. You'll probably be attempting to read it for a long time
and get nowhere. The best way to get the data off an encrypted dvd is to
use mplayer to give the drive the decryption keys, such as mplayer
dvd://1 (for the first chapter, dvd://2 for the 2nd, etc...). Then pause
it, and commence backing up.

Note: This won't remove the encryption on the dump at all, but it does
allow a playable backup of scratched media. If you dumped this raw image
back to a dvd, it shouldn't work in a regular player, because (from what
I've heard) there is secret key data on a readable but non-writeable
portion of the DVD, probably for copy protection.

Hope that helps,
Charles

Olivier Delhomme wrote:

> 2009/1/15 Antonio Diaz Diaz <antonio_diaz@...>:
>
>  
>> Try to rescue the dvd on another reader and if the first pass rescues
>> nothing, give up. sorry.
>>    
>
> Hello,
>
> I know that I might not tell you to use something else in this list, but,
> to recover dvds you might try different drives and also different
> software such as dvdisaster (http://dvdisaster.net/en/). You may
> try all combinations...
>
> Cheers,
>
> Olivier.
>
>
> _______________________________________________
> Bug-ddrescue mailing list
> Bug-ddrescue@...
> http://lists.gnu.org/mailman/listinfo/bug-ddrescue
>
>  

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