Re: Problems reading CDROMs on an ALPHA DS10

From: Hoff Hoffman (hoff-remove-this_at_hp.com)
Date: 06/24/05 

Date: Fri, 24 Jun 2005 19:24:56 GMT

Chris Blackburn wrote:
> Anyone ever encountered problems reading CDROMs on an ALPHA platform when
> the CDROM was originally produced on a PC ?

   There are potential problems with CD-R and CD-RW media access on
CD-ROM devices, and particularly involving older CD-ROM devices. (CD-R
and CD-RW provide comparatively marginal reflectivity when compared with
pressed media, and older drives might not correctly or reliably read the
newer photochemical media. Older CD-ROM drives can and often do have
problems -- the RRD42 drive, for instance, has seen problems reading at
least some of the CD-R and CD-RW media on the market. If this is the
root problem here, do try testing different recording media for
compatibility, and do consider replacing any ancient optical drive with
a somewhat less-ancient model.)

   As for the usual problem with reading Microsoft Windows or various
other platforms on OpenVMS, it is because the volume structure selected
for the CD-R or CD-RW includes the Red Rock or Joliet extensions. The
OpenVMS F11C/D file system support for ISO-9660 does not provide these
particular extensions.

   It is also possible that the media mastering tool has committed one
or more errors in the generation of the volume structure, the classic
example here being a failure to provide the 8.3 filename within the
created ISO-9660 volume structure. (Some tools implicitly assume the
target platform supports Joliet, and don't generate the parallel 8.3
filename.)

   As for the usual discussions around generating CD-R, CD-RW DVD+R,
DVD+RW and other such media directly on OpenVMS, do remember to skim the
related information in the OpenVMS FAQ.

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