Yamaha PSR 9000 V2 Problem with Disk Drive and HD

[Borislav]

The keyboard has not been used in many years. When i turn on the keyboard it works, but the hard drive cant read the midi files that was stored.

The internal disk driver on the keyboard also cant read midi files from my floppy disks, but if i use an external disk drive to my pc, i can read my midi files.

How can this be repaired so i can read(use) midi files from the floppy disks on the keyboard?

Is the HD and DD replaceable, if so what type fits this model keyboard.

Is there any way to connect an external disk drive to the keyboard without USB?