Epson 20 - Manual (Page 95)

To change from ACCOUNTS back to LEDGER, you can use the
special symbol . . or you can use an absolute pathname. (The . . symbol
always designates the parent directory.) In other words, you can type:
CD . .
or
CD \ACCOUNTS
Formatting Diskettes
Before you can store data on a new diskette, you must format it.
Formatting prepares the diskette so that MS-DOS can write to it. You
need to do this only once, before you use the diskette for the first
time.
You can reformat previously used diskettes. This process erases all
data on the diskette. Always be sure you do not want to save any of
the data on a used diskette before you format it.
The formatting procedure you use depends on whether your
computer has one or two diskette drives and whether it has a hard
disk. Follow the instructions below for your configuration.
Using
MS-DOS with Your Equity 386 5-17