[ale] ddrescue on cdrom

[James Sumners]

I don't understand this. The CD already includes Reed-Solomon codes for
error correction. Sucking up more space on the disc with a second helping
of Reed-Solomon codes shouldn't do anything other than reduce the amount of
usable disc space. Especially since PARs are usually ~20% of the original
data.

On Thursday, February 23, 2012, JD wrote:

> Try a different drive.
>
> In the future, you might want to include par2 files with the data. This
> isn't
> foolproof, but it has helped me to recover 2 failing DVDs that were not
> completely gone.
>
>
>
> On 02/23/2012 03:08 PM, John Anderson wrote:
> > I was trying to see if I could rescue anything off of a cd-r which shows
> up as
> > blank when I attempt to read it. It supposedly has data on it and I can
> see the
> > telltale color difference that implies that it was in fact written to.
> >
> > I tried ddrescue-
> >
> > /ddrescue  -b2048 /dev/sr0 traincdimage  traincdlogfile/
> >
> > /
> > Press Ctrl-C to interrupt
> > Initial status (read from logfile)
> > rescued:         0 B,  errsize:       0 B,  errors:       0
> > Current status
> > rescued:         0 B,  errsize:   3179 MB,  current rate:        0 B/s
> >    ipos:     2148 MB,   errors:       1,    average rate:        0 B/s
> >    opos:     2148 MB,     time from last successful read:    54.1 m
> > Finished        /
> >
> > This appears to be a complete fail.
> > Any comments? Running Mint 12.
> > log file below.
> >
> >
> >
> >  Rescue Logfile. Created by GNU ddrescue version 1.14
> > # Command line: ddrescue -b2048 /dev/sr0 traincdimage traincdlogfile
> > # current_pos  current_status
> > 0x80170800     +
> > #      pos        size  status
> > 0x00000000  0xBD850000  -
> >
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-- 
James Sumners
http://james.roomfullofmirrors.com/

"All governments suffer a recurring problem: Power attracts pathological
personalities. It is not that power corrupts but that it is magnetic to the
corruptible. Such people have a tendency to become drunk on violence, a
condition to which they are quickly addicted."

Missionaria Protectiva, Text QIV (decto)
CH:D 59
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