Agarbled Up Disk - Tandy TRS-80 Owner Manual & Programming Manual

A
GARBLED
UP
DISK
If
You have Problems During
Backup
If
you
get
an
error
message while
you're
backing
up
a
disk,
it's
probably because you've
inserted the
disk incorrectly or there
is
something
wrong
with
the
disk.
At
the
end
of this chapter,
we
discuss
error
messages
to
help
you determine
the prob-
lem.
If
you have
a
bad
disk,
you
will
need
to
try
BACKUP
with another
disk.
After
determining
the problem, press the
RESET
button
to
get out of
BACKUP.
Then
start the
BACKUP
procedure
all
over
again.
I
Note:
The
RESET
button
is ore
the
right-hand
rear
of
your Computer (when
you're facing
it).
"WRITE"
PROTECT
IT
"Write-protecting"
is
one
more
way
to
protect
your
disk
files.
Let's
assume you have
a disk which
con-
tains
some
valuable information
—
such as a good
program
—
which you
don't
plan
to
change.
You
plan
to
"read"
its
contents
daily,
by loading the
program
into
memory,
yet
you never
plan
to
"write"
(store
information)
on
it.
Putting
a
little
gummed
label
on
the
WRITE-
PROTECT
NOTCH
will
enable the
Computer
to
read the
disk,
but not
to
write
on
it.
Any gummed
label will do.
There
is
one
which comes
with your
new, unformatted
disk:
SALVAGE
IT
We
mentioned
earlier
that a disk
doesn't
live for-
ever.
Before
you throw
away
an
old
disk,
though,
see
if
you can salvage
it.
You
may
be
able
to
do
this
by formatting
it
all
over again
as
if
it
were
a
blank
disk.
Although
this
might
salvage the
disk,
it
will
not
salvage
the contents of the
disk.
By
reformatting
the
disk,
you
will
erase everything on
it.
However,
it
will
save
you
the expense
of
purchasing
a
new
disk.
If
you
get
an 10
error while trying
to
reformat
it
(see
"Error Messages"
at
the end
of this chapter),
the disk
has probably reached
its
limit. If
you have
a "bulk-eraser,"
you can
try "bulk-erasing" the
disk
and
reformatting
it.
Otherwise, throw
it
away
and
use another
one.
I
Note:Ifyou have more than one
disk drive,
you might
be able to
COPY
some
of the
files
on a bad
disk
to
a
good
disk.
We
discuss
COPY
in the next chapter.
VERIFY
IT
The Computer
"writes"
data on your
disk
at
a very
fast speed. In
almost
all
cases,
it
can
do
this
flawlessly.
There might be times
when
you want
to
be abso-
lutely
certain that there are no
flaws
in
what
the
Computer
is
writing.
If
so,
you can
turn
ON
the
Computer's
VERIFY
command.
To do
this,
type:
VERIFY
ON
(ENTER)
Now
the
Computer
will notify you,
whenever
it
is
writing on a
disk,
if
there are
any
flaws
in
what
it
is
writing.
The
only catch
is
that
it
will
take
twice
as
long
for the
Computer
to write.
For example,
let's
assume you now make
a
BACKUP
copy
of
your
disk.
The Computer
will
take twice
as long
doing
this,
but
will notify
you
if
there
is
a flaw
in
the
BACKUP
copy.
This
VERIFY command
will
remain
ON
until
you
turn
it off.
To do
this, type:
VERIFY OFF
(ENTER)
15