ufs and Plextor PX-708A 1.04

Mark Knight markk at knigma.org
Mon Feb 23 05:14:59 PST 2004

I'm running 4.9-stable from November.

I've recently installed a Plextor PX-708A v1.04 DVD rewriter.  I'm
getting good results using growisofs.

On the belief that +RW support random access, for a bit of fun I created
a ufs filesystem on the device with freshly formatted DVD+RW media:

  disklabel -r -w cd0c auto
  newfs /dev/cd0c
  mount -o noatime /dev/cd0c /mnt

On the face of it, the mounted filesystem then appears to work. However,
intermittently (within minutes, but after several MBs), read errors

>(cd0:ata1:0:0:0): READ(10). CDB: 28 0 0 1 65 a8 0 0 20 0
>(cd0:ata1:0:0:0): MEDIUM ERROR info:465b0 asc:11,5
>(cd0:ata1:0:0:0): L-EC uncorrectable error
>(cd0:ata1:0:0:0): cddone: got error 0x5 back

I'm probably being hopelessly ignorant.  Should this work?  I believe
the drive supports DVD+MRW (Mt. Rainier), and that this is supposed to
implement some sort of defect management.  However, is OS support
required as well?

Any advise appreciated.
Mark A. R. Knight                               finger: markk at knigma.org
Tel: +44 7973 410732                            http://www.knigma.org/

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