Messages in this thread |  | | From | (Eberhard Moenkeberg) | Subject | Re: CD-ROM I/O error: dev 0b:00, sector 843150 | Date | 29 May 1996 16:02:13 GMT |
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Herbert Rosmanith (herp@wildsau.idv.uni-linz.ac.at) wrote:
: does the above message mean that the cdrom (the disk, not the drive) : is defective ? : I get a lot of this messages after dd if=/dev/scd0 of=/dev/null:
: scsi0 channel 0 : resetting for second half of retries. : SCSI bus is being reset for host 0 channel 0. : SCSI CD error : host 0 id 4 lun 0 return code = 18000002 : Current error sr0b:00: sense key Medium Error : Additional sense indicates Random positioning error : CD-ROM I/O error: dev 0b:00, sector 843136 : scsi0 channel 0 : resetting for second half of retries. : SCSI bus is being reset for host 0 channel 0. : SCSI CD error : host 0 id 4 lun 0 return code = 18000002 : Current error sr0b:00: sense key Medium Error : Additional sense indicates Random positioning error : CD-ROM I/O error: dev 0b:00, sector 843138
: the bad thing is that I cannot ^C the process doing dd nor kill -9 it, : so it's stuck somewhere in the kernel. or do you have to wait for : some minutes ? (sync, df will hang from now on...)
Probably you simply reached "end of medium" (about 400 MB size?). With SCSI drives, the drivers can't recover from that read-ahead- into-the-unformatted-section-error. A SCSI specification and/or driver bug, in effect under Linux since about 1.2.5. With other CDROM drivers, the read request returns a "fail" to the higher level (ll_rw_blk), and there is an error counter.
Cheers -e -- Eberhard Moenkeberg GGG W W DDDD GGG G W W D D G E-Mail: emoenke@gwdg.de G GGG W W D D G GGG Phone: +49 551 2011551 Fax: +49 551 21119 G G W W W D D G G SnailMail: GGG WW WW DDDD GGG Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH Am Fassberg, D-37077 Goettingen, GERMANY At home: Modem+ISDN ("guest") ++49-551-7704102, ISDN-HDLC 7704103
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