> >> 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." > 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.
