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REPAIR
COMMAND
22. 1 - - Use
required by the operator depends upon two things:
the amount
of
actual
damage
on
the
diskette
and
the
amount
of
information
the
operator
wants to recover From the damaged
tables.
IF
the operator merely permits
REPAIR
to
perrorm
every
suggested
action
to correct every error,
then the resulting
diskette is guaranteed
to have
e~ror
Tree system tables.
In
this
case,
the
amount
Or
systems
knowledge
required is
insignificant.
On the other handl
if the operator
takes
notes
during
the
REPAIR
command
on
what tables are damaged, and
i~
the
operator does not choose
to
delete
those
riles
that
are
invalid,
then a great deal about the the MDOS rile structure
and system tables must be xnown to
reconstruct
the
tables"
Chapter
24
describes the system structure in detail.
It
is
required reading ror a
complete
understanding
Or
ali
the
functions
and the errors that the
REPAIR
command can perrorm
and detect.
The REPAIR command must be invoked from a
working
MOOS
diskette.
Thus,
if
a
given
diskette
cannot be used
~or
initialjzation,
it must be placed into drives
onel
two,
or
th~ee,
and
anothe~
working diskette
(or
the same
MDOS
version
as the dammaged diskette) placed into
d~ive
zero
before
the
REPAIR command can be used.
REPAIR
does
not
attempt
riles.
It
only attempts to find
tables.
to
rind
errors within data
errors
within
the
system
It
is
suggested
that REPAIR be used
Fo~
the following
reasons:
1.
As
a
regular diskette checking utility.
It never
hurts
to
run REPAIR as a preventative maintenance
tool to catch
erro~s
as they may
be
developing,
before
serious
malfunctions
are
noticed.
If
nothing is wrong with
a
diskettel
no
ope~ator
interaction
is
~e~ui~ed.
REPAIR
will
simply
return
to
MDOS
after
having
displayed
some
monitoring information.
2.
If
strange
things
start happening or if system
e~ror
messages
are
displayed
without
apparent
reason.
IF
files
or
records
within
files
disappear or get scrambledJ
the system tables may
have been damaged.
3.
If MDOS will not run at all.
Page
22-02
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