7500
HD
Laptop
Computer
board. For example, do not type the letter
0
for the
number
0,
or the letter
I
for the number 1.
ABOUT THE DRIVES
The Tandy
1500
HD has an internal floppy diskette
drive and a hard disk drive. You can start the oper-
ating system and most application programs either
from the hard disk or the diskette.
The hard disk drive is called Drive C, and can store
20 million bytes
(20
MB) of data. The hard disk can
store much more information than a floppy disk,
and it takes less time to find information on a hard
disk than on a floppy disk.
When you store programs (such as
MS-DOS)
and
other information on a hard disk, we recommend
that you keep backup copies of the programs and
data on a floppy disk. This prevents the
loss
of all
your programs and data even
if
the hard disk is ac-
cidentally damaged.
The diskette drive is called Drive
A,
and uses 3
14-
inch floppy diskettes. You can use either high-den-
sity diskettes that store 1.44
MB
of data (Cat.
No.
26-423),
or
double-density diskettes that store 720
KB
of data (Cat.
No.
26-417).
USING THE HARD DISK
You seldom need to use your floppy disk drive ex-
cept for copying files and making backups of hard
disk files. You
also
can use this disk drive to copy
your application programs to the hard disk.
BACKING UP YOUR HARD DISK
Making backups of hard disk files is extremely im-
portant. Because the storage capacity of
a
hard
disk is
so
much greater,
loss
of data can result in
the
loss
of thousands of hours
of
work.
You can use the BACKUP command to make cop-
ies of one or more directories or of the entire hard
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