| From: Volker Kuhlmann <[EMAIL PROTECTED]> | Completely forget all your this-year's redhat references. This problem | existed at least with kernels 2.2 and 2.4, and is probably as old as | Linux (see references to it for kernels 1.3 in older mkisofs/cdrecord | source around the -pad option). In 2.2 it didn't usually show, in 2.4 it | was difficult to prevent.
I've not experienced it until 2.6. I often read raw CDs to compare what is on the CD with a .iso file. My recollection is that before 2.6, there was code to better guess the size of a volume. I was told this, so I don't know what form the code took. | Adding zeros to your image files doesn't change your checksums if you | compute them properly, ie on the ISO image only. I've got scripts for | all the above in my scriptutils package. It does damage any signatures | though, there you ought to use padding with mkisofs. I think that K3B does an md5sum of the disk, taking its idea of file length from the drive. This just does not work. The md5sum command does not take a length argument, so you need to use dd piped to md5sum, where the dd does the truncating. My (long ago) experience with this pipeline was quite unpleasant: I think that it busted the disk cache (as in: the cache was ineffective, not buggy). | The default 20k padding was nowehre near enough on some DVD ISOs on 2.4. Default for what? -pad? DVD mastering? | I agree that it would be useful in growisofs. However a suitable wrapper | script should fix it too. | | > /usr/bin/growisofs: no mkisofs options are permitted with =, aborting... | | Well, if that "=" is with -Z, then growisofs is told to burn an image, | where you're already past mkisofs and therefore barfing on mkisofs | options is a good thing as it may save you a coaster (and makes no sense | either). mkisofs, a mastering program, implements -pad/-padsize. But I'm proposing a second meaning: post-mastering padding. Perhaps the option name should be changed, but I think that the idea is useful. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
