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REPAIR COMMAND
22.2 -- ID, LCAT, CAT, Bootblock Sector Check
sector cleared the error, REPAIR will proceed
to
check
the
contents of the CAT.
The CAT must show that all parts of the
diskette locked out by the LCAT are flagged as allocated (see
above
for
LeAT
val"idity criteria>.
If
the
CAT
contains an
error at this point,
REPAIR will display the message
C.A.T.
IN
ERROR - RECONSTRUCT?
and
await
a
result
in
message
response from
an
unfixable
the operator.
An tiN" response will
diskette.
REPAIR
will
show the
DISK IS
NOT FIXABLE
and
return control to
MOOS.
CAT
to
be
reconstructed
Phases 2
th~ough
4.
A "Y" response will cause
a
new
~rom
the information gathered in
After checking the CAT, REPAIR will attempt ta read
the
Bootblock
sector.
If
the Bootblack sector cannot be read,
REPAIR will display the following message:
**PROM
I/O ERROR-STATUS=31 AT 2EDC ON DRIVE
l-PSN
0017
BOOT
BLOCK SECTOR
READ ERROR
WRITE TO DISK TO ATTEMPT TO CLEAR ERROR?
The operator must respond
wi
th either a
try..
or
uNfI.
to
the
last q,uestion.
'I~
an "N" is entered} REPAIR
wi
11 d isp lay the
message
BOOT BLOCK SECTOR CANNOT BE CHECKED
before continuing.
Since the Bootblock is
not
affected
by
other
system
tables,
REPAIR
~ill
continue
to
check the
remainder of
the
diskette;
however,
a
diskette
~ith
a
damaged
Bootblock
sector cannot be used as an MOOS diskette
in drive zero.
If a "Y" is entered, REPAIR will
attempt
to
rewrite
the
sector in an attempt to clear the error.
If an
error develops during the writel
the sector is unfixable
and
the
diskette can never be used to initialize the system from
drive zero.
If the Bootblock sector is readable or if the
error
is
cleared
by rewriting the sector, REPAIR wi.ll verify that the
sector contains a valid copy of the
Bootblack
program.
If
the data is in
~T'ror;
the message
BOOT BLOCK SECTOR HAS BEEN DESTROYED
WRITE TO DISK TO ATTEMPT TO CLEAR ERROR?
will
be
displayed.
An liN" response wi1 leave the Bootblock
sector' unchanged.
A "Y" response will cause a neUf
Bootblock
to
be written to the diskette.
The REPAIR command will then
begin Phase 2.
Page
22-07
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