Epson Apex 20020 - Manual (Page 93)

Note that if you change from one drive to another and then try
to access a file on the previous drive, MS-DOS remembers
which was the default directory when you were last logged onto
that drive. For example, suppose the last time you were logged
onto drive C, the default directory was the root directory. Now
you are logged onto drive A and enter the following command
to delete the file JEAN1204.DOC:
DEL C:JEAN1204.DOC
MS-DOS tries to find the file you want in the root directory of
drive C, but the file is not there and an error message appears
on the screen. For this case, you would need to enter the
complete pathname as in the previous example.
If you do not know what the default directory on another drive
is, it is a good idea to include the full pathname whether you
need it or not. You can never give MS-DOS too much
information.
If you want to change to another directory on another drive,
just include the drive designator in the command-like this,
for example:
CD C:\WORDPROC\PERSONAL
Using MS-DOS With Your Computer 4-21