Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!decvax!ucbvax!BU-CS.BU.EDU!bzs From: bzs@BU-CS.BU.EDU.UUCP Newsgroups: mod.computers.vax Subject: tk50 problems Message-ID: <8612180227.AA17313@bu-cs.bu.edu> Date: Wed, 17-Dec-86 21:27:20 EST Article-I.D.: bu-cs.8612180227.AA17313 Posted: Wed Dec 17 21:27:20 1986 Date-Received: Thu, 18-Dec-86 22:19:13 EST Sender: daemon@ucbvax.BERKELEY.EDU Organization: The ARPA Internet Lines: 18 Approved: info-vax@sri-kl.arpa From: johnh@seismo.CSS.GOV@wheaton.UUCP (John Doc Hayward) >Interesting additional notes: >if you do a dd if=file of=/dev/rmt0 bs=80 ; mt weof >the tape mark is written at the begining of the tape rather than after the file. Because /dev/rmt0 rewinds the tape after the dd is finished. >If you instead do a dd if=file of=/dev/rmt12 ; mt weof >the tape mark is written after the file. Because /dev/rmt12 does not rewind the the tape after dd is finished. This is all documented, see MT(4) [hint: why do you think there are so many different names for the tape drive device? aha! block-oriented, densities, (no)rewind and unit #]. -Barry Shein, Boston University