Imaging SCSI hard disks

From: Jerome H. Fine <>
Date: Wed Sep 1 22:05:35 2004

>Paul Koning wrote:

> >>>>> "Zane" == Zane H Healy <> 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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Received on Wed Sep 01 2004 - 22:05:35 BST

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