Date: Tue, 24 May 2022 20:56:58 -0400 From: "Kevin P. Neal" <kpn@neutralgood.org> To: "Steve O'Hara-Smith" <steve@sohara.org> Cc: freebsd-questions@freebsd.org Subject: Re: Tape, was Single User Message-ID: <Yo1%2B2m1LA9ivCuJb@neutralgood.org> In-Reply-To: <20220519223448.e1db4297aef551734852e4fd@sohara.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>
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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". -- "You know what I mean." -- US patent 8,011,992B2, "Apparatus For Facilitating The Construction Of A Snow Man/Woman"
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