Epson Apex 20020 - Manual (Page 62)

WARNING
If you write to a 360KB (or 160KB, 180KB, or 320KB)
diskette while it is in a 1.2MB drive, you may not be able to
read it or write it in a 360KB drive later.
3½-inch drive/diskette compatibility
Drive type Diskette types it can read from and write to
720KB 720KB
1.44MB 720KB, or 1.44MB
Because of these incompatibilities, you should indicate the
density and diskette type when you label your diskettes.
(Usually this information appears on the manufacturer’s label.)
If you have any combination of the above drives (360KB,
1.2MB, 720KB, or 1.44MB), you can copy files from one drive
to another-using the COPY or XCOPY command-as long as
the correct diskette type is in each drive. You can use these
commands to copy files between the hard disk and any type of
diskette. You cannot use DISKCOPY to copy from one drive to
another if the two drives are not the same type.
Caring for Diskettes and Diskette Drives
Follow these basic precautions to protect your diskettes and
avoid losing data:
Do not remove a diskette from the diskette drive or turn off
the computer while the drive light is on. This light
indicates that the computer is copying data to or from a
diskette. If you interrupt this process, you can destroy data.
Remove all diskettes before you turn off the computer.
Keep diskettes away from dust and dirt. Small particles of
dust or dirt can scratch the magnetic surface and destroy
data. Dust can also ruin the read/write heads in a diskette
drive.