The CBM D9090 was Commodore's large storage medium for the CBM/PET
The total drive capacity, formatted, is 7.5 MB.
Difficult to come
by, but certainly worth it when found.
They can also be easily repaired. One of the two in the large photo
below (the one on the left) has actually had it's power supply
replaced with an IBM Power Supply, and the hard disk replaced by a
40 MB Miniscribe. If you need any assistance repairing a D9090,