>From: Andy Polyakov <[EMAIL PROTECTED]> >> >> I have a Plextor PX-708UF (USB 2.0) on a Red Hat Linux 9 machine. >> >> >> >> cdrecord.prodvd: Input/output error. read disk info: scsi sendcmd: no error >> >> CDB: 51 00 00 00 00 00 00 00 24 00 >> > ^^ I don't know if following holds true >> >for other USB implementations, but Linux USB is very picky about >> >> First: Cdrecord added support to circumvent Linux USB DMA Bugs about >> 3.5 years ago.
>If I wanted to imply that cdrecord doesn't circumvent USB bugs/specifics >I would have written "that's because cdrecord apparently ..." It wrote >nothing of that sort!!! I wrote "structure is 32 bytes upon media load, >which must be the cause for the trouble." And the Plextor says (upon request) that the strucure is 0x22 + 2 byte header >> This happens, if you run the command with a DVD+R medium while >> the Kernel SCSI transport is working correctly to the Plextor 708: >> >> Executing 'read disk info' command on Bus 0 Target 0, Lun 0 timeout 240s >> CDB: 51 00 00 00 00 00 00 00 24 00 >> cmd finished after 0.000s timeout 240s >> Got 36 (0x24), expecting 36 (0x24) bytes of data. >> Received Data: 00 22 00 01 01 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 >> 05 40 00 00 00 00 00 00 00 00 00 00 00 00 >Is it output from requestor's system? If not is it USB connected unit? >But in either case given this new evidence, I have to admit that I might >be wrong and it might turn out to be a firmware bug or pecularity... MMC >drafts are specific about length of this structure being 32+8*n. So that >the reported length is indeed bogus... Well, one has all rights to >disregard bogus values... A. This is from a Plextor 708 (as I wrote.....) Even if the Plextor had a firmware bug and returns less, then USB should not create the problems that may only be a result of a DMA _overrun_. Jörg -- EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin [EMAIL PROTECTED] (uni) If you don't have iso-8859-1 [EMAIL PROTECTED] (work) chars I am J"org Schilling URL: http://www.fokus.fraunhofer.de/usr/schilling ftp://ftp.berlios.de/pub/schily ./ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]