Sorry... but there's no way to really be certain that they work with OPL.
How can i try them??????? i cant buy many of them.....
Just avoid cheap ones, and it's not necessary to get one that uses a AC adaptor (Use a Y-cable if they won't work when plugged into 1 USB port).
The disk must be re-formatted as a FAT32 disk.
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS