Imaging SCSI hard disks

From: Kevin Handy <>
Date: Thu Sep 2 10:57:29 2004

Jerome H. Fine wrote:

>>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
>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!!!
Under Linux, I attach to the cdrom using

    ATTACH RQ1: /dev/cdrom

Hard disk should be similiar (something like /dev/sda).
I don't think simh for Windows allows for raw device access like that.
Received on Thu Sep 02 2004 - 10:57:29 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:37:26 BST