Epson 3865X Plus - Manual (Page 88)

To remove the diskette, press the release button. When the
diskette pops out, remove it and store it properly.
Caution
Never remove a diskette or reset or turn off the computer
while the diskette drive light is on. You could lose your data.
Also, be sure to remove all diskettes before you turn off the
computer.
Formatting Diskettes
Before you can store data on a new diskette, you must format it
using the FORMAT command. Formatting prepares the
diskette so that MS-DOS can write data on it. You need to do
this only once, before you use the diskette for the first time.
You can also reformat previously used diskettes to store new
data. This process erases all the data on the diskette, so be sure
you do not want to save any of the files on a used diskette before
you format it. See your MS-DOS Reference Manual for
instructions on using the FORMAT command.
Using
Your Computer
3-21