README.verify
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- Mini-Howto for verifying a selfmade CD
- 1) verifying the data layer
- To verify if all data on the disk can be read,
- use SCSI verify. This can be done with the
- sformat utility.
- use: sformat -verify [target] [lun] [scsibus]
- If the CD-R device is connected to target 2 on SCSI bus 0
- sformat -verify 2 0
- sformat can be found on ftp://ftp.fokus.gmd.de/pub/unix/sformat
- NOTE: Not all CD-ROm drives support verifying
- NOTE: All TAO tracks end in 2 unreadable run-out sectors
- 2) verifying the filesystem layer
- A quick check is to mount the CD and to use star to read
- all files on the filesystem.
- mount -r /dev/cdrom /cdrom (modify for your OS)
- cd /cdrom
- star -cPM . >/dev/null
- If no errors can be found, all files are readable.
- star can be found on ftp://ftp.fokus.gmd.de/pub/unix/star
- You also may want to compare the filesystem on the CD
- with the original data. This can be done with star too.
- (cd /master_for_cd; star -cPM .)|(cd /cdrom; star -diff -v)
- 2a) verifying the iso image before creating the CD
- You may check the filesystem image by mounting it with my
- "fbk" on Solaris or the loopback driver on Linux.
- On Linux type:
- mount isoimage.raw -r -t iso9660 -o loop /mnt
- On SunOS type:
- mount -r -F fbk -o type=hsfs /dev/fbk0:isoimage.raw /mnt
- The check the filesystem with:
- (cd /master_for_cd; star -cPM .)|(cd /mnt; star -diff -v)
- When doing this you have to know about the bugs in Linux/Solaris
- Mkisofs before 1.10 and Linux have a bug with timezones.
- If you are using mkisofs-1.10 and newer on Linux, you need to disable
- comparing times:
- (cd /master_for_cd; star -cPM .)|(cd /cdrom; star -diff -v diffopts=!times)
- The same is needed if you are using mkisofs pre-1.10 on Solaris
- Solaris has a bug with hardlinks. It generates different inode numbers
- for the hardlinks to a file. This makes it impossible for star to
- check hard links. Use
- (cd /master_for_cd; star -cPM .)|(cd /cdrom; star -diff -v diffopts=!hardlink)
- in this case.
- Joerg Schilling