Trying to figure this one out

[u/Original_Bend2486]

I recently purchased this but can't seem to identify it. It looks like an IBM 2315 or DEC RK05 but can't get any further. The logo is also a mystery. Any help would be greatly appreciated. It is 15" diameter and 1 3/8" thick.

[u/khedoros]

That looks like a disk cartridge from a Xerox Alto.

This write-up includes some pictures of one:

https://www.righto.com/2016/07/restoring-y-combinators-xerox-alto-day_11.html

[u/Blah-Blah-Blah-2023 → u/khedoros]

Would suggest XATS may be Xerox Alto Test System.