Epson EQUITY 3865X/20 PLUS - Manual (Page 198)

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 from most computer stores. However,
do not use a cleaning kit too often because excessive
cleaning can damage your drive heads.
Hard Disk Problems
If you are having problems with the hard disk in your computer,
you may see one of the following error messages:
1760
1761
1770
1771
1780
1781
1782
1790
1791
Disk 0 parameter failure
Disk 1 parameter failure
Disk 0 parameter error
Disk 1 parameter error
Disk 0 failure
Disk 1 failure
Disk controller failure
Disk 0 error
Disk 1 error.
Troubleshooting A-19