Re: plextor px-708uf: cannot get disk type
> >> 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.
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