On Thu 09 May 2013 01:43:35 NZST +1200, Thomas Schmitt wrote: > Let dd copy the computed number of blocks from medium to /dev/null: > dd if=/dev/sr1 bs=2048 count=1700758 of=/dev/null > > If this ends by an i/o error (often near the end of the medium) > then the burn was not successful.
Or you could be dealing with a stupid Linux kernel that hasn't got fixed for the last 15 years. If the recording ends at the end of the filesystem (common, for obvious reasons) and the size of the filesystem is not a multiple of some internal Linux buffer size, the last buffer Linux tries to read is incomplete and gets treated with an I/O error, although the only error is that of the programmer trying to read past the end of the legimitate recording. The workaround is to turn off read-ahead for this test, and perhaps DMA as well. Easy with hdparm, but that's no use no more, and sdparm doesn't seem to do it. The other good thing to do with Linux is to append 2MByte of zeros at the end of the filesystem and burning that with it, just to keep the kernel from falling over itself when reading it later. Volker -- Volker Kuhlmann is list0570 with the domain in header. http://volker.dnsalias.net/ Please do not CC list postings to me. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
