Mixing Drives on XY451

[Jeffery Cavallaro]

A few days ago, I submitted a problem regarding the mixing of different
types of Fujitsu drives on a XY451 controller.  With a little help from
XYLOGICS and a little experimentation, I have solved the problem.  To get
both drives up, run format and following the following rules:

	1.  DRIVE 1 - In supported type list

		Select disk type defaults.  Note that the "type" number in the
		menu != the actual "runtime" type code (more on this later).

	2.  DRIVE 1 - Not in supported type list

		Use the "unknown" option to set explicitly specify the geometry
		information.  Give this drive a "type" of 0 when prompted.

	3.  DRIVE 2 - In supported list or otherwise

		Always use the "unknown" option and specify a type of 1.
		Unfortunately, you have to specify all of the geometry
		information.  In addition, the type name may not match any
		of the supported names.  The program checks and if the name
		matches, the type number of 1 will be ignored and 0 will be
		used.

Either the XY451 firmware (or SunOS, I am not sure which) builds a
geometries table at boot time.  It uses the type number assigned by format
to index this table.  Format assigns type 0 to all drives, except unless
told to do otherwise during an "unknown" definition.  Thus, my problem.
My M2372K would cause type 0 geometry to be defined.  Upon seeing the
M2351, type 0 would be read from the label, and a geometry mismatch would
occur.

Of course, if the two drives have the same geometry, there is no problem.
The type ids can be the same.

Jeff