jeffery@sys.caltech.edu (Jeffery Cavallaro) (06/13/89)
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