I have an Amstrad CPC6128. I replaced and serviced the drive belt a few years ago, but now I am getting some disc errors. The drive is making noise but a few discs are reporting 'disc missing'. However, other discs continue to work as expected for read and write.
Sometimes I can 'cat' the files, but then the disc fails on subsequent access. I will take the drive apart if I need to, but I'd like some guidance as to probable cause.