[Simh] Disk info request

[hb]

On 03/09/2016 09:53 AM, Johnny Billquist wrote:
> Do VMS and ODS-2 really try to figure out a geometry per disk for MSCP
> disks???

The ODS2 utility needs to "mount" the disk. I know nothing, but ODS-2 on 
VMS probably only cares about LBNs and VBNs (and on on-disk data 
structures). It is the mount utility which knows or needs to know the 
geometry, to do the geometry based search for alternate home blocks 
(there is also a non-geometry based search algorithm). And the mount 
utility probably uses the same code as the init utility, which writes 
the alternate home blocks. And both probably request the information 
from some other (driver) code level.