Radio Shack TRS-80 Hardware Manual page 30

To
run the application
program. Jblkw
the instructions
in
your
Model
4/4P Disk
System Owner's
Manual.
Backing
Up
a
Hard Disk
To safeguard the information stored
on
hard
disk,
you should
periodically
make
a
backup copy on
floppy
diskettes.
To
do
so,
lullgw ihws«
steps;
1.
Start
up
or
re-set
the
computer
with the
Boot
Diskette.
2.
Look
at the directory of
the hard disk
to
determine the
total
amount
ol
space
taken by
the
files
on
thai disk.
10
do
this,
type the 01
R
command
followed by the
hard
disk drive
number
and
ihen
(l,S).
This
eommana,
for
example,
displays the
total
space
consumed
by
the
files
on Logical
Hard Disk
Drive
1:
DIR
:1
<I,S)
CENTER)
Al U
ie
bullum ofthe
Ufciplyy
is Hits
message
Spa
lb
=
futluwed
by the
space taken by
the
liies (in
kilobytes, or "kbytes").
Note:
Look
at
the
F
i
L
e
Size
column
on
the
display
If
any
individual
file
exceeds
174K
bytes,
you need
to
use
HDCOPY4,
instead
ol
BACKUP,
to
copy
that
hie.
When
backing up
the
ol
her
files,
use the
Q
U E H
Y
opt ion of
BACKU
P
to
skip that
f
1 1
s,
(See Chapter
6
of this
manual
for
information
on
HDC0PY4,
See
your
Mode!
WP
Disk
System Owner's Manna}
for infor-
mation
on QUERY.}
a
Calculate the
number
of
TRSDOS-forrnatted
floppy diskettes
yuu
nyetl.
Tj
Ut>
Hiis,
divide the
"kitdl
spate
uoiisunied"
liyuiu
by
174,
(A
newly
formatted floppy diskette
can
held
about 174K
or 178,176
bytes.)
Round
the
result to
the next higher
whole
number.
For example,
if
the
Space
= message shows
the
total
space
to
be 435K, you need
3
floppy diskettes;
435
/
174
=
2.5
(rounded
Of)
=
3)
4.
Format the
number
of floppy diskettes
you
need and one
extra
in
case
of
a
problem.
Then
place
one
of the
w
rite-enabled,
fun
i
sallt^J dis ket lea
1 >
a
f
I
v^py
J
i
ive.
E
1 1
te
r
the
BACKU
P
W*
i
i-
mand.
Trie
following
command
copies
each
file
on source
drive
to
the floppy
diskette
in
destination
drive:
BACKUP
source
drive destination drive
LENter)
24