Messages in this thread |  | | From | (Eberhard Moenkeberg) | Subject | Re: Read from CD-Rom -> crash | Date | 27 May 1996 11:21:50 GMT |
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Thomas Niederreiter (tn@bv.rz.fh-muenchen.de) wrote:
: there is a quite critical bug in the CD-Rom-Code which caused for me : some extreme heavy crashes. (Reset-Button only)
This bug shows up only with SCSI CDROM drives, and it "was born" at about 1.2.5.
: A CD-Recordable written under Linux works well, except you want to read : the last few sectors. (e.g. when copying this CD).
Formerly, I verified my self-written CDs with SCSI drives (different brands, mostly Toshiba); was less CPU consuming than "my own" drives. Since abot 1.2.5, at the end of the CD the system hung. Because at those days I didn't find time to research, I reverted to use Panasonic and Teac drives (sbpcd), and now I'm using IDE/ATAPI drives with success, too.
: The last 4 blocks (each 2048 bytes) can't be read in most cases. : And here on kernel pre2.0.7 this causes the total blackout. : 1.3.98 just reports a lot of sense-errors but recovers.
: I know that these 4 blocks are written on CD-R. (I can get the exact : number of blocks on a CD from the ISO9660-Header).
Maybe it is simply a non-working recovery from errors during read-ahead (into the "unformatted" section).
: I tested this only with SCSI-CD-Roms. (Don't have others)
This error does at least not exist with sbpcd and ide-cd.
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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