Re: [gentoo-user] DVD Movie backups

[David Haller <gentoo@dhaller.de>]

Hello,

On Fri, 16 Dec 2011, Mark Knecht wrote:
>On Fri, Dec 16, 2011 at 9:06 AM, Michael Mol <mikemol@gmail.com> wrote:
>> No; you'll have to decrypt, or do without the encrypted bits.
>> dvdbackup is probably the closest to what you want.
[..]
>Interesting. So even something that just copies blocks of data, like
>dd, can't be used for that purpose?

Depends on the disk. There's some you can copy with ddrescue, some
not. Have a tail -f on the messages, you can't use dd / ddrescue /
dd_rescue if you get stuff like this in the log:

kernel: [17700.046666] end_request: I/O error, dev sr0, sector 252120
kernel: [17700.131687] sr 16:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
kernel: [17700.131698] sr 16:0:0:0: [sr0]  Sense Key : Illegal Request [current] 
kernel: [17700.131707] sr 16:0:0:0: [sr0]  Add. Sense: Read of scrambled sector without authentication

Note the "scrambeld sector". If you don't get those, it should work in
most cases. If you get those, use e.g. k3b to rip an iso-image (or
rather udf-image) of the disk, or use 'dvdbackup -M' to copy the
data. There's some "broken" disks though with intentional defects in
the filesystem etc., often from Fbal. You usually won't be able to
copy those "whole" and images witk k3b will probably be
defective. Using dvdbackup, dvdcpy, lxdvdrip, mplayer, tccat or so to
copy only the titles that you actually want (main feature, extras, but
e.g. no trailers and stuff) will be the only way.

HTH,
-dnh

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