Epson Apex 20020 - Manual (Page 185)

Floppy Disk Drives and Controller Check
Use this option to test the performance of the diskette drives
installed in your computer. This test includes several checks
that allow you to identify particular problems related to your
diskette drives.
Before running these tests, format a diskette to use for the tests
that write data on the disk in the drive. To test a 1.2MB drive,
you can use a 1.2MB or a 360KB diskette. However, to test the
full capacity of the drive, use only a 1.2MB disk.
Likewise, in a 1.44MB drive you can use a 1.44MB or a 720KB
diskette, but a 1.44MB diskette is best to test the full capacity
of the drive. In a 360KB drive, you can use only a 360KB
diskette, and in a 720KB drive, you can use only a 720KB disk.
Note
The Format diskette option on the OPERATION MENU
cannot format a 1.2MB disk. Therefore, to test a 1.2MB
drive, use the MS-DOS FORMAT command to format a
high-density diskette.
You can select the individual tests from this menu:
FLOPPY DISK DRIVE(S) AND CONTROLLER CHECK MENU
1 - Sequential seek check
2 - Random seek check
3 - Write, read check
4 - Speed check
5 - Disk change check
6 - Run all above checks
0 - Exit
Enter selection number:
Performing System Diagnostics C-21