So IBM was working on a 4" disk drive in the early 80s, which they called the DemiDiskette eventually. It was canceled before coming out.pic.twitter.com/HoPjtRaSGp

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I'm gonna see if I can message the winner to make sure we're in contact, because I'd love to see what's inside this and any additional info they have.
there's some weirdness going on with the auction. since it ended, they relisted it twice, deleting the first one, and then relisting it as "for glimminge only". glimminge is the person who won the first auction, and I think they re-listed it because of international shipping
and @ptrcnull pointed out that the logo is the same as the one on the TC500 drive, which I really should remember because I OWN ONEhttps://twitter.com/ptrcnull/status/1316015010758320130 …
which suggests it's related to Tabor Corporation, which was founded in 1982 and dissolved in 2000: So maybe it is just a coincidence? Tabor built drives for Dysan's 3.25" Flex Diskettes.pic.twitter.com/KIy2JW2oEY
A mention in Byte from October 1984 says that Tabor was only making 3.25" drives for the past year, before adding a 3.5" drivepic.twitter.com/vkZazCkEMM
This does add some other interesting info: Educational Microcomputer Systems had announced a 3.25" system but was changing it to 3.5", and General Scientific Corporation was shipping workstations with 3.25" drives.
BTW another possibility is that there's no IBM connection at all. The "fact" that the IBM disks were called "Tabor" at some trade shows has a [citation needed] on it and there don't seem to be any mentions of that on the web that don't relate back to wikipedia
so maybe the DemiDiskette was never called Tabor in the first place and this is just someone misremembering something from 40 years ago and stuffing it into wikipedia
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