I just wrote an iso image to a virgin CD-RW with the following command: burncd -f /dev/acd0c -s 24 data 5.2.1-RC-i386-disc1.iso fixate
and the burncd program said: next writeable LBA 0 writing from file 5.2.1-RC-i386-disc1.iso size 657024 KB written this track 657024 KB (100%) total 657024 KB fixating CD, please wait.. which is consistent with the iso image file size = 672792576 bytes = 657024 KB = 328512 2KB records. When I read the data back in from the CD with this command: dd if=/dev/acd0c of=xxx bs=2k the dd program says: dd: /dev/acd0c: Input/output error 328510+0 records in 328510+0 records out 672788480 bytes transferred in 252.669511 secs (2662721 bytes/sec) which is consistent with the xxx file size = 672788480 bytes = 328510 2KB records. Note that this is 4KB short of the expected file size. The acd driver produced this error message on the console: acd0: READ_BIG - MEDIUM ERROR asc=0x11 ascq=0x05 error=0x00 Recent SCSI standards further explain asc=0x11 ascq=0x05 as meaning "L-EC UNCORRECTABLE ERROR" and "L-EC" as "Layered Error Correction". I don't believe for a second that my CD medium just happened to have a bad sector at the very end of the iso disk image. Could this be a hardware glitch? Could the error message be incorrect? Is a driver bug involved? Notes: 1) I am running FreeBSD 4.9-RELEASE. 2) The CD-writer is a SAMSUNG SM-352B. 3) I get similar errors (not sure of the ascq) when any of my CD drives (both ATA and SCSI) try to read the first blank sector at the end of a CD-R (should be a short read or EOF). Dan Strick [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"