I have a Mitsumi D357 disk drive which is only working single-sided (360K). Formatting a (known working) disk double sided results in a "disk error". Reading files of a DS floppy lists some of the files followed by "disk offline".
In other posts a read that a faulty head (upper) could cause this? From the outside the drive / heads look OK (if i compare it with a working D357).
PS: cleaning the heads I already tried but did not fix the issue.
