Epson 386/25 - Manual (Page 266)

To make the necessary repairs, use the MS-DOS program
CHKDSK. See your MS-DOS Reference Manual for
instructions.
Diskette Drive Problems
You may see the following message if you are having trouble
with a diskette or your diskette drive:
601 Diskette error
If you see this message or have difficulty with a diskette drive,
follow these steps:
1. Try running the Diskette Drives and Controller Check
described in Appendix E. If the diagnostics program
indicates an error, consult your Epson dealer.
2. If the diskette drive is making loud noises, do not attempt
any further examination of it. Contact your Epson dealer.
Note
Diskette drives may make different sounds with different
diskettes.
3. If your diskette drive read/write heads are dirty, you may
occasionally see this MS-DOS error message:
Error Reading Drive d:
Abort, Retry, or Fail?
To clean the read/write heads, use a diskette drive head
cleaning kit, available in most computer stores. However, do
not use a cleaning kit too often because excessive cleaning
can damage your drive heads.
D-18 Troubleshooting