I've found a lot of issues with disks not booting / starting to get bad sectors, are due to combinations of the disks physically not turning, and the 1050's pressure pad that rests on them being worn away.   You can try roughing up the surface of the pad a bit with the end of a paperclip. I have replaced a few with some made from old cassettes but they don't seem to last too well. This is covered in "Don't Dump Your Drive" article in Page 6 magazine Issue #75 If anyone has some proper spares p