Date: Tue, 19 Mar 1996 05:31:10 -0800 (PST) From: Greg Lehey <grog> To: se@ZPR.Uni-Koeln.DE (Stefan Esser) Cc: questions@freebsd.org Subject: Re: HP 35480A help needed Message-ID: <199603191331.FAA27686@freefall.freebsd.org> In-Reply-To: <199603191304.AA18143@Sisyphos> from "Stefan Esser" at Mar 19, 96 02:04:20 pm
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> > On Mar 19, 13:47, Michael Elbel wrote: > } Subject: Re: HP 35480A help needed > } > } Since the HP35480A is a DDS-1 drive, it won't read/write 120 meter tapes. > } > } You need a HP C1533A for that. I've not managed to write 60 and 90 meter > } > } tapes on one of these under FreeBSD though although it *should* work. > } > > } > My HP C1533A reads and writes 90m tapes just fine ... > } > > } > } Very interesting. I can read old 60 and 90m tapes fine. As soon as I try > } to write to one of them, I get: > } > } Mar 19 13:43:17 wiley /kernel: st0(ahc0:4:0): DATA PROTECT asc:30,0 Incompatible medium installed > > Ok. That are most probably old 90m tapes, which > don't have the MEDIA RECOGNITION SYSTEM lead in. 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). 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. > 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? Greg
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