17 Feb
2019
17 Feb
'19
11:32 a.m.
On Feb 16, 2019, at 1:04 PM, Bill Gunshannon via
cctalk <cctalk at classiccmp.org> wrote:
...
First, my hardware. I have a PDP-11/93 with a CMD SCSI Module and
a BA350 with 6 2GB hard drives. The Module is set up to present RA81
disks and the first 3 disks have 4 partitions each which should work
out to 12 RA81 disks. (But that last part is unimportant right now!)
A real RA81 has 891072 blocks, i.e., it's 445 MB. If your partitions are indeed 1/4th
of a 2 GB disk they may be just over 512 MB. If so, your RA81 image is not valid for
those partitions.
Try shrinking the partitions to be the actual RA81 size, or slightly larger.
By the way, another possible issue: the free space bitmap in file SATT.SYS is created at
pack format time to be large enough for the number of clusters on the disk. If you move
the image to a bigger disk, even one with the same device cluster size, it may be that the
number of pack clusters now exceeds what SATT.SYS describes. That too is an invalid file
system. I would expect that to give a more explicit error message, but it may be that
this doesn't happen in INIT, or not at this stage.
Either way, the short answer is: RSTS will object to file systems moved to a smaller
destination, or to one that is too much larger. What is "too much" depends on a
number of details.
paul