31 Aug
2004
31 Aug
'04
5:23 p.m.
Zane H. Healy wrote:
I haven't done this on a PDP-11, but have done it with SCO Unix,
Linux, and FreeBSD drives. It's all geometry. I do know that BSD v2
sets partitions on cylinder boundaries, so the principles should be the
same as in later platforms.
You need a target disk with the same head/sector geometry as the
source. The number of cylinders is a lot less critical, as long as the
target isn't smaller than the source.
You can actually get away with using an unmatched target as long as
fsck never runs. :)
I dunno about other OS disks. The little I know about RT-11's
filesystem implies that most any old disk should work.
Doc
I've a
couple of SCSI hard drives (DEC RZ24-S) that I'd like to do a
complete image of. If I stick them in a linux box and do a dd on them,
will it copy all the blocks from the device, or am I going to get
Well, I can't really speak for the specific hardware you're going to use.
However, I've taken 100MB and 200MB IBM drives out of my PDP-11/73,
connected them to a Linux box via a SCSI controller, dd'd them off to a disk
image. I've then ftp'd the disk image to a Mac, written the disk image to
CD-R. Then taken the CD-R, placed it in the PDP-11/73's CD-ROM drive and
booted the PDP-11 off of CD-ROM.
What I've not attempted to do is dd a disk image back to a SCSI HD. It's on
my list of things to try, but who knows what decade I'll finally find the
time.