Talk:Checking the integrity of a Live CD
From MEPIS Documentation Wiki
The "md5sum /dev/cdrom" method, now also in the 7.0 beta 5 Manual (section 2.3), may be quite unreliable. Good discussion is here , citation:
If I had not specified -dao (session at once mode) and taken the cdrecord default recording mode (track at once), the following would have happened: # md5sum /dev/cdrom md5sum: /dev/cdrom: Input/output error Further stubborn attempts at verification might produce something like: # dd if=/dev/cdrom bs=2048 | md5sum dd: reading `/dev/cdrom': Input/output error 269860+0 records in 269860+0 records out ...some bad sum here ... And you would be convinced you had a coaster.
Users might get false errors for quite usable media, just due to garbage following the very end.
I think we should at least add something like "This test fails for CD recorded 'track at once'. Use 'session at once' mode (-dao switch when using cdrecord)."
Any idea for reasonably simple test command immune to this? Hanzl 05:24, 24 September 2007 (EDT)
Added some screen shots, discussion of the K3B verify bug and info on how to find the optical device name /dev/??? Marvin02 10:14, 15 March 2009 (EST)