The best way to write QD media is to use a TEACFD55GFV or FD55F as both work. Then the actual media is the BROWN or 360k stuff that has been bulk erased. The resulting disks will be reliable aswsuming the drive hasn't been munged or the formating incorrect. A PC FDC can drive these drives and will/can format them. You will need a utility program that does disk reading and formatting with CP/M formats. FYI: the TEAC drives are my favorite for any 80track format either single or double sided. I use them as substition for RX50s as well. Allison