TRS-80 Color Computer double sided 5.25" disk
From Just Solve the File Format Problem
The TRS-80 Color Computer double sided 5.25" disk was a disk format used by the TRS-80 Color Computer (CoCo), with the FD-502 (26-3133) drive. Other drives for the CoCo used the TRS-80 Color Computer single sided 5.25" disk instead.
