Re: growisofs vs. LG GSA4040B: unable to CLOSE SESSION (5h/72h/03h):Input/output error

[scdbackup@gmx.net]

> I did a plain cmp command:
> 	# cmp /dev/scd0 /space1/hugh/EJHR-toshiba.iso
> 	cmp: EOF on /space1/hugh/EJHR-toshiba.iso
> Although that is an error message, it is one that suggests success!
> 
> In other words, from the viewpoint of an cmp, all the bytes of the
> .iso file were there.  The fact that the raw disk didn't have an EOF
> at the end is neither surprising nor worrisome.

I just made a test (data on floppy shorter than on disk file) :

  $ echo 1234567 >$HOME/x
  $ echo 12345 >$HOME/xx
  $ dd bs=1 count=5 if=$HOME/xx | cmp $HOME/x -
  5+0 records in
  5+0 records out
  cmp: EOF on -

Seems to be the effect you encounter and seems not to mean "ok".
I would interpret it as "matching file start - but data truncated".

My experience with (CD-RW) media is that if they fail, then they fail
to return the full number of bytes. I never had the effect that the
expected number of bytes could be read but failed the MD5 test.
(Maybe with DVD this is different.)


Have a nice day :)

Thomas