From: <Paul_Koning at Dell.com> Hm... disks have controller-specific boot blocks, but I thought tapes were universal. Yeah, the RSTS generic tape boot is quite a nice piece of black magic! (And, not to beat a dead horse, but E11 likes it fine on all four tape types and can mount raw real SCSI drives too, with the size you say.) From: Cory Smelosky <b4 at gewt.net> I need the /physical/ drive size! Different systems give me different sizes. If you've got it on a real PDP-11, you can try my DUTEST program (from RT-11, or if you have some other way to load it stand-alone and start it at 1000, it doesn't actually need an OS): http://www.dbit.com/pub/pdp11/rt11/dutest.mac It's a reverse-engineering tool (from when I was working on MSCP/TMSCP) so the command set is pretty low-level, but this sequence should get you the MSCP controller's idea of the unit size: .RUN DUTEST DUTEST by John Wilson <wilson at dbit.com> Copyright (C) 1997-1999 by Digby's Bitpile, Inc. All rights reserved. =init Returned values: DI Step 1 bits 7:0=000 (documented as 000) Port type = 0, reserved step 3 bits 10:8 = 0, model = 006, FW version = 02 =op scc =g = Received packet: SCC END FLAGS=100000 Message credits: 8 =op onl =unit 0 =g = Received packet: ONLINE END UNIT=0 UNIT SIZE=204800 Message credits: 8 = "=" is the prompt. Change "unit 0" to the actual MSCP unit. And enter a blank line after each "g" (go) command to make the program check for response packets. "op gus" (with "unit n" and "g") does a "get unit status" command if you want more details about the drive. "quit" halts (then 173000G or CNTRL/BOOT or whatever, to reboot). John Wilson D Bit