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Re: bin/38171 (mount_ffs doesn't work on CDs)

The following reply was made to PR bin/38171; it has been noted by GNATS.

From: "Michael L. Hitch" <>
Subject: Re: bin/38171 (mount_ffs doesn't work on CDs)
Date: Mon, 31 Jan 2011 11:05:40 -0700 (MST)

 On Mon, 31 Jan 2011, wrote:
 > State-Changed-From-To: feedback->open
 > State-Changed-By:
 > State-Changed-When: Mon, 31 Jan 2011 08:09:50 +0000
 > State-Changed-Why:
 > Feedback timeout. Does anyone have ffs/ufs CDs (with non-512 blocksize) they
 > can test?
    I may have some DEC ufs CDs - but the problem is almost certainly that
 the ufs is written using 512 byte blocks, and CDROM drives used by old DEC
 systems present the CD data as 512 blocks (although they are recorded on
 the CDROM as 2048 byte blocks.  The only two ways I can think of that 
 would allow mounting those CDs is to either modify the cd(4) driver to 
 buffer the 2048 byte blocks and present them as 512 byte blocks, or to 
 modify ufs to do the equivalent.  The alternative is to use a CDROM drive 
 that can present the data as 512 blocks.
 Michael L. Hitch             
 Computer Consultant
 Information Technology Center
 Montana State University       Bozeman, MT     USA

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