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From: plummer@hercules.cs.uregina.ca (Dave Plummer)
Newsgroups: comp.sys.amiga.misc
Subject: ST157N Drives
Message-ID: <467@regina.uregina.ca>
Date: 14 May 91 20:28:00 GMT
Sender: news@regina.uregina.ca
Reply-To: plummer@hercules.cs.uregina.ca (Dave Plummer)
Organization: University of Regina, Regina, Saskatchewan
Lines: 12
Originator: plummer@hercules

I'm having some trouble trying to figure out how the hard drive geometry
is represented.  My ST157N drive _should_ have 94860 blocks.  That's
94548 data + 2 reserved + 310 reserved for HardBlocks.  That it does.
 
If you look at the aparrent SCSI geometry, that's 155 * 612 cylinders.
That's what I expected.  Now the question:  what kind of drive has 155
sectors per track?  That's _not_ 0-155, that's 155 per track.  Is one
reserved by SCSI as a spare?  Is that a function of the drive or the
A2091?  How do you determine if/how many are set aside?  Is it always
one?
 
Could this be what the rdb_CylBlocks field represents?