Date: Wed, 25 May 2022 12:52:55 +0200 From: Polytropon <freebsd@edvax.de> To: "Kevin P. Neal" <kpn@neutralgood.org> Cc: "Steve O'Hara-Smith" <steve@sohara.org>, freebsd-questions@FreeBSD.org Subject: Re: Tape, was Single User Message-ID: <20220525125255.10b45abf.freebsd@edvax.de> In-Reply-To: <Yo1%2B2m1LA9ivCuJb@neutralgood.org> References: <CA%2ByoEx8Jk_sceftUUuXi5Hq0Vq2TS=dgAgz7cJ5HweF9u0H5Gg@mail.gmail.com> <ff3cbab9-14e3-987c-ef1d-968c3ca31b14@kicp.uchicago.edu> <24632e11-1a86-8553-cf44-d29aa40a6858@kicp.uchicago.edu> <YoaLcXjAkIyqNEQ/@c720-r368166> <t66ahf$128c$1@gal.iecc.com> <20220519223448.e1db4297aef551734852e4fd@sohara.org> <Yo1%2B2m1LA9ivCuJb@neutralgood.org>
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On Tue, 24 May 2022 20:56:58 -0400, Kevin P. Neal wrote: > On Thu, May 19, 2022 at 10:34:48PM +0100, Steve O'Hara-Smith wrote: > > On 19 May 2022 20:49:51 -0000 > > "John Levine" <johnl@iecc.com> wrote: > > > > > The thing in the picture isn't paper tape, it's a 1/2" magnetic tape. > > > It looks relatively new, 1970s rather than 1950s so it is likely > > > recorded 9 bits across (8 plus parity) at a density of 1600 or 6250 BPI. > > > > I didn't look at the picture. That could be a *lot* harder to read > > even if you have a drive. I've heard tell of tapes that could only be read > > once due to storage damage rendering them more than a little fragile. > > Oh, no, did data tapes also have this problem? The problems with Ampex 456 > in a certain range of time are well known. I've seen it called "sticky > shed". Seems to depend... I have ome (!) audio tape that has had "dry loss" of magnetic material (not sticky, only crumbs), but I also have a data tape ORWO Typ 430 (6250 bpi) probably from the early 1980s that is still in mechaincally perfect condition. Maybe there are "bad batches" of tape just as it were with floppy disks (BASF), optical discs (EMTEC) and hard disks (IBM DTLA) with this specific kind of problem? IEF280E K 3D0,1069SS,LICHTAUS,ANALYSE2 IGF991E MOUNT PENDING FOR DEVICE 3D0,SER=1070SS IEF403I SVDRUCK STARTED TIME=10.58.35 ;-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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