Imaging SCSI hard disks

[Jerome H. Fine]

>Paul Koning wrote:

> >>>>> "Zane" == Zane H Healy <healyzh at aracnet.com> writes:
>  Zane> My idea is actually to first dd the HD to a disk image, then
>  Zane> prep that disk image under SIMH or E11.  Copy the data I want
>  Zane> on the HD to the image using the emulator, and then dd it back
>  Zane> to the HD.  Logically it should work just fine.  With RT-11,
>  Zane> you shouldn't even need to dd the HD to a disk image, just
>  Zane> create whatever size disk image and dd it out there.  The other
>  Zane> OS's would be a bit more picky.
> Not necessarily.  If you tell the simulator that it has an MSCP disk,
> the OS should just accept whatever size it is, because the rule of
> MSCP is that the disk tells the OS its size and the OS makes no
> assumptions.  Certainly RSTS does this correctly.
>
> As for "geometry" -- MSCP doesn't have any that the OS can see, or at
> best it has just some vague hints that actually serve no real
> purpose.  That certainly fits with modern drives -- anything built in
> the last 10 years or so has a software geometry that has no connection
> to reality, and a real geometry that's (a) not visible, (b) much more
> complex than tracks and cylinders of fixed size.  Look at IDE disks,
> for example; they all claim to have 15 heads and 63 sectors, or
> whatever is the max in the old IDE conventions.  But those numbers
> have nothing to do with reality, they exist only for backward
> compatibility.

Jerome Fine replies:

HELP!!  Something seems to be missing.  Is SIMH being used
with SCSI hard disk drives are are the SCSI hard disk drives
first being copied to a hard disk file AFTER which SIMH does:
ATTACH  RQ0:  hard_disk_file.DSK
I don't know of any command that allows SIMH to ATTACH
a raw SCSI hard drive like E11 allows.  What am I missing
in this discussion?  PLEASE!!!

Sincerely yours,

Jerome Fine
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