Can't read backup dvd's under edgy

[Branko Vukelic]

On Sunday 22 October 2006. 22:03, Nigel Ridley wrote:
> Just did a clean install of edgy on my Toshiba laptop; updated, dist
> upgraded, installed all the nice codec stuff etc. but can't read my
> backup dvd's that I can on my dapper [main] box (the laptop used to be
> able to under dapper).
> The laptop can play dvd movies - just can't read my backup dvd's :-( my
> backup cd's it can read fine - just not the dvd's.

First of all, I did a google search on on of the error msgs that you 
originally posted:

>> [520938.360344] isofs_fill_super: bread failed, dev=hda, iso_blknum=16, 
>> block=16

Don't know how and how much this is related to your prob, but here goes:

http://www.ubuntuforums.org/showthread.php?t=2264
http://www.linuxforums.org/forum/debian-linux-help/38242-mount-cd-dvd-rom-problems.html


> Any ideas someone?

Now, I don't know if you are aware of this, but when burning DVDs that are to 
be used on another system (box), you need to keep two things in mind (at 
least):

1. Do not burn at high speeds. Use at most half the maximum speed supported by 
your media.

2. Do not burn multi-session discs: close the first session when burning.

You may try this: copy your backup DVD onto another disc using single session 
and burning at reduced speed (for example, if your disc is declared as a 4x 
disc, burn at 2x or 1x). 

Also, try different type of DVD: if you used +, then try -, and vice versa. 
This is especially important if your other drive (laptop one) is older.

There are other factors, like some manufacturers emulating (badly) brand name 
disc characteristics. This causes the software to burn assuming specs that 
don't really fit the medium. Some drives will do a fine job, but some may 
burn discs that can only be read on the same make/model drives.

Hope this helps.

B