Paul Smith wrote:
Dear All
Is there some way to verify whether a CD/DVD was correctly burned?
This is a more common question on the cdwrite mailing list, here's how.
Assume /dev/hdc is the CD burner, and orig.iso is the ISO filesystem you
burn.
blox=$[$(wc -c <orig.iso / 2048]
dd if=/dev/hdc bs=2k count=$blox | md5sum - orig.iso
Wasn't that easy? No? Did you leave off the "<" in the first line? Now,
if you have certain kernels, when reading a CD/DVD the readahead past
EOF is botched. In that case you have to disable readahead on the CD with
blockdev --setra 0 /dev/hdc
(as root). PITA? Yes, update your kernel or live with it.
The two lines can be put into a script which takes the filename. Or if
you like which takes the filename, the burner device, runs the burn and
does a verify.
Anyway, that's how you do it...
--
Bill Davidsen <davidsen@xxxxxxx>
Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.
