11/93 rebuild - test-drb@ccmp.vtda.org

29 May 2019

...
  From: Holm Tiffe 
...
 > The "--list" command to 'dd'
gives a whole bunch of stuff: 
...
  aha:
 $ dd --list
 dd: unknown operand --list 
I was talking about the program I had mentioned in the previous email, "dd
for Windows". The "--list" command to it produced that long list of
devices
(the list you edited out of the reply), so it definitely works there.

...
  Nobody in a PDP11 is interested what Windows thinks
about partitions. 
Understood, but in my previous email I had given an example using a uSloth
partition:

...
 > dd-removable if=UnixRoot
of=\\?\Device\Harddisk2\Partition0 count=4872 seek=131072 
so when your reply mentioned "partitions" ("You have to have an already
existing parition structure on the disk") it was natural to assume you meant
those - especially since there was a plausible reading of your comment
involving them (i.e. 'does "dd for Windows" only work on a disk with an
existing uSloth partition structure on it').

...
  Most of the PDP11 SCSI Controllers could build two or
more PDP11 disks
 out of one physical device. That is what I meant with partition in this
 case .. There is some logical information on the device, you simply
 don't get the entire raw device on the pdp as you possibly think. 
That's a good point, and perhaps there's no existing way to write a SCSI disk
...
 from a Windoze box in a way that the PDP11 SCSI
controllers can grok. I don't know enough about how they work to answer that.

...
  Tapes have no such restrictions 
Right, but one has to have a tape drive; the OP may not.

       Noel