This was a data disc for a Bryant 4000 Disc Drive built in the early 60's. There's an
IPhone resting against it for scale. The disc had a capacity of around 8 megs and
was used with a series of discs inside a rather large machine as shown on the right.
Here's a wiki excerpt from The History of Hard Drives:
"In 1961, Bryant Computer Products introduced its 4000 series disk drives.
These massive units stood 52 inches (1.3 m) tall, 70 inches (1.8 m) long, and
70 inches (1.8 m) wide, and had up to 26 platters, each 39 inches (0.99 m) in
diameter, rotating at up to 1,200 rpm. Access times were from 50 to 205
milliseconds (ms). The drive's total capacity, depending on the number
of platters installed, was up to 205,377,600 bytes (205 MB)."
Brayden: "I remember this when I was studying up on ships. Ain't that somethin?"
Res: "The size of ships has always amazed me. When I lived in Japan a friend &
I would go down to the USN docks in Yokosuka with lawn chairs & snacks, and
watch them for hours. Vietnam was still happening and the US port would also
get our allies ships coming in for a break from war."
But, alas, the reign is over. In 2017, no family members were willing to take over the business.
Keiunkan's general manager, Kenjiro Kawano, was selected as the new president. Because
Kawano was unrelated to the owner he was unable to inherit Yushima, the holding company.
Ownership of Keiunkan was transferred to a new holding company, Nishiyama Onsen
Keiunkan Limited, and Yushima was dissolved.
Wiki Page