From owner-freebsd-questions Tue Mar 19 05:46:00 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id FAA28587 for questions-outgoing; Tue, 19 Mar 1996 05:46:00 -0800 (PST) Received: from Sisyphos (Sisyphos.MI.Uni-Koeln.DE [134.95.212.10]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id FAA28485 for ; Tue, 19 Mar 1996 05:44:03 -0800 (PST) Received: by Sisyphos id AA19508 (5.67b/IDA-1.5 for questions@freebsd.org); Tue, 19 Mar 1996 14:42:26 +0100 Message-Id: <199603191342.AA19508@Sisyphos> From: se@zpr.uni-koeln.de (Stefan Esser) Date: Tue, 19 Mar 1996 14:42:26 +0100 In-Reply-To: Greg Lehey "Re: HP 35480A help needed" (Mar 19, 5:31) X-Mailer: Mail User's Shell (7.2.6 alpha(2) 7/9/95) To: Greg Lehey Subject: Re: HP 35480A help needed Cc: questions@freebsd.org Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Mar 19, 5:31, Greg Lehey wrote: } Subject: Re: HP 35480A help needed } To the best of my knowledge, the MRS code is in three small holes on } the underside of the cartridge. DAT tapes, and also older DDS tapes, } don't have the holes (there is a recess about 0.5mm deep to show where } they are, but that's all. The real holes are deeper than you can see, } at least 3 mm). No, MRS uses a tape header with a certain pattern of vertical stripes. } Older HP drives would accept uncoded cassettes, but it looks like } newer ones don't. The result is that I can't read my own old, } original HP cartridges. The new HP drives can be made to accept the old cartridges. They got a switch to disable MRS ... } > If they are true DDS DAT tapes, then you can } > disable MRS and this way enable writing onto } > those tapes ... } > } > MRS was designed to protect against erronous } > writing on Audio DAT tapes ;-) } } Of course, they also prevent deliberate writing on audio DAT tapes. } How do you disable it? It is switch 3 on the 8 switch block on an HP C1533A, AFAIK. I have kept a posting to the "comp.periphs.scsi" news group, and I'll send it to freebsd-scsi, since I got several requests for that information meanwhile ... Regards, STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/~se