On 08/24/2013 03:03 AM, Ed Greshko wrote:
On 08/24/13 15:52, Martin S wrote:
I have a set of DVDs - about 6 years old - I wanted to check out what was
on them. All but 1-2 produce input/output erros and can't be read. I
opened them on my wifes Windows box, and they were read without any
problems at all.
In Dolphin it opens as empty. [mskjoldebrand@dragon K3b data project]$ ls
ls: reading directory .: Input/output error
[mskjoldebrand@dragon K3b data project]$ sudo tail -s 3 -f
/var/log/messages Aug 24 09:48:11 dragon kernel: [11573.619129] iso9660:
Corrupted directory entry in block 0 of inode 53504
Can something be done?
Are the DVDs commercially produced or were they written on DVD∓R or DVD∓RW
media?
I have experienced many cases with non-commercially produced DVDs would be
readable in one drive and non-readable in another and it wasn't O/S
dependent.
in addition, with a dvd that give errors, try;
dd if=/dev/sr0 of=/dev/null
if you get errors, put an old cd of about same age in drive, repeat above
command to see it you get errors.
if you get errors only with dvd's, drive may be going bad. dvd ability
usually goes first.
and, usually inner tracks tend to show bad first.
compact disk are not best archival media as they will/may/can go bad after
a long time. especially ∓RW.
hold bad dvd's up with a light behind them to see if you have 'bright spots'.
hold burn side up at an angle to light. see any unusual reflection? badly
marred or scratched areas?
something very surprising, years ago, someone i know had a commercial music
cd that when you held it up to a light, it looked like a sieve, but played
without anything noticeable. but that is slow speed audio and ear, not high
speed data, or an o-scope display. :=)
another problem is head may/could/might be at an opposite side of +/-
tolerance of alignment from head that dvd's where written with.
if you can get access to a new or fairly new drive, swap it out with one
you have to see if drive is going bad.
--
peace out.
in a world with out fences, who needs gates.
sl6.3 linux
tc.hago.
g
.
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