This listing is for an Atari 810-compatible disk drive (manufacturer unknown) without a housing. It was tested 1/22/26 and is fully working. Testing was done by connecting to my Atari 800 and loading in a DOS disk, in this case I used SmartDOS, as shown in photo.
The sale includes;
the disk drive as shown
a power supply for it
The drive will be shipped with a floppy disk inserted, to protect the read/write head in transit.