CH20N. Internal, full-height SATA. 4(?)xBD-ROM.
Bought secondhand. It does work, but has a bad attitude. Doesn’t play nicely after being used in direct access mode - can choose to ignore all attempts to interact with it for a short period (before springing back to life) so requires
new owner with more patience.
Yours to take home today in exchange for a promise to later donate what it is worth to you to hackspace funds.
Gavin