All of them are for various hard drives. None floppy of any sort.
The first 4, 2840, 34, 21, and 09 all look like ones I'd use on a Western Dynex either 5mb or 10mb (capacity) drive. 100tpi or 200tpi.
The others are progressively higher density, someone else may recognize them. Epay periodically has some guy listing them for high prices, and though I'd never pay what he wants if you can find his listings, they might be a good reference if noone else here turns up with an answer.
From the ages of the guys I knew in the 70s and 80s that serviced these, and their disposition of working on the hardware, they're probably all mid 70s, and not paying much attention to this sort of thing anymore. They certainly knew the subject well, the ones I knew.
A fellow I knew ran AHMCO (After Hours Maintenance, Company), which was well named, as when does this crap fail. anyway, hopefully someone has either memory or knowledge of these.
I've got a few sets for my older Microdata Marathons, and Dynex drives in similar packaging.
On a side note from my experience, wish more companies had used the pink plastic for bagging boards, and this foam, as I've not seen any of it broken down like many types of foam. And I'm talking about Los Angeles air, which kills anything plastic with ozone.
thanks Jim On 5/30/23 20:57, devin davison via cctalk wrote:
I picked up boxes of these disk heads when i picked up a warehouse stockpile of pdp 11 computers. Any idea what they are to? I want to say floppy? I have 2 different types of heads, in boxes. Please see pics, and if anyone needs heads, im the guy that has a bunch to part with now. Let me know what kind of drive they are for if you can, i have no clue. https://i.postimg.cc/nrHTdwcV/20230528-182840.jpg https://i.postimg.cc/y8JjrRBR/20230528-182834.jpg https://i.postimg.cc/sfcTBywM/20230528-182821.jpg https://i.postimg.cc/2y2GgFVQ/20230528-182809.jpg https://i.postimg.cc/4N2w5PCZ/20230528-182617.jpg https://i.postimg.cc/W1Q8R4bH/20230528-182614.jpg https://i.postimg.cc/28S2hJK2/20230528-182606.jpg https://i.postimg.cc/25hwCf18/20230528-182555.jpg https://i.postimg.cc/DZ3xGw9X/20230528-182543.jpg
