this post was submitted on 14 Nov 2025
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Installing An 84MB Hard Drive Into A PDP-11/44 (hackaday.com)
submitted 16 hours ago by cm0002@no.lastname.nz to c/retrocomputing@lemmy.sdf.org
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Over on YouTube [Usagi Electric] shows us how he installed an 84MB hard drive into his PDP-11/44.

In the beginning he purchased a bunch of RA70 and RA72 drives and board sets but none of them worked. As there are no schematics it’s very difficult to figure out how they’re broken and how to troubleshoot them.

Fortunately his friend sent him an “unhealthy” Memorex 214 84MB hard drive, also known as a Fujitsu 2312. The best thing about this hard drive is that it comes complete with a 400 page manual which includes the full theory of operation and a full set of schematics. Score!

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