[plug] CDROM weirdness

[craig at postnewspapers.com.au]

> When I use dd and md5sum to verify CDs I burn, dd
> seems to read slightly more than the original image
> (maybe 4-8 kb). I'm guessing this is the fixating
> section of the CD. If I use count= , the md5sum
> matches that of the original ISO. Hence the CD does
> work, but it's very annoying having to specify the
> count value.
I think ISO9660 tracks have to be padded out to fill the last sector on
the CD, and thats what you're getting as part of the MD5SUM - the
padding bytes. Hence count= fixes it as you ignore the padding.

If this is the case, and I'm fairly sure it is, there isn't much to be
done but use a count= argument all the time.

-- 
Craig Ringer
IT Manager, POST Newspapers
http://www.postnewspapers.com.au/    http://oberthur.dyndns.org/~craig/
GPG Key Fingerprint: AF1C ABFE 7E64 E9C8 FC27  C16E D3CE CDC0 0E93 380D
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