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DOSGEN COMMAND
10. 1 -- Use
then copy all files that have the "system" attribute from the
diskette in drive zero to
the
destination
diskette.
When
DQSGEN
is
finishedJ
a
complete MDOS system will have been
generated on the destination diskette.
10.2
Diskette Surface Test
If
DOSGEN is invoked with the
"T"
optionl
a
write/read
test
~ill
be
perrormed
to
ensure that the sectors on the
destination drive are
good.
Any
sectors
which
fail
the
write/read
test
will be flagged with the deleted data mark.
If sectors cannot be flagged in
this
mannerl
the
diskette
cannot
be
genel"ate<i.
Su-ch
diskettes
may
oe made usable
again
by
using the
FORMAT
command (Chapter
15>'
If a sector can
be
marked
as
bad}
th~n
the
cluster
to which the bad sector
belongs will
be
automatically locked
out
from
MDOS
usage.
This individual cluster lockout is independent
Or
the area
of
diskette that can be lOCked out by
the
operator.
It
will
allow
diskettes
~ith
bad
spots
to
be ,generated and made
usable as MDOS system diskettes.
Diskettes that have such
bad
sectors
can
be
used
as
normal
diskettes
with
the following exception.
The BACKUP
command should not be invoked without a Main
Option
(unless
the
IIDII
option
is
used)
to
make
a complete copy
Or
the
allocated space.
Without the
"DIt
option,
the
complete
copy
process
will
abort if
a
ratal read error occurs.
Since the
complete copy
is
based
on
the
allocation
table,
it
is
inevitable that the bad sectors locked out via DOSGEN will be
read.
Thus, the resultant copy of the diskette
will
always
be
incomplete.
Thererorel
BACKUP should
al~ays
be run with
the URn option to rorce rile reorganization.
In this manner,
the
bad sectors will never be read since they
are
not a part
oT any allocated file.
Diskettes which have had bad sectors locked
out
should
not be used as the destination diskette with
BACKUP.
If
sectors
get
locked
out into which the MOOS system
riles normally are copied (in the
first
several
cylinders)
the
OOSGEN process will fail.
Such diskettes cannot
be
used
as
MDOS
system diskettes unless the
FORMAT
command
(Chapter
15) can be used to correctly rewrite the bad sectors.
10.3 Minimum System
Generation
If
the
DOSGEN
command is invoked UJith the "U" options
the resultant diskette
will
not
contain
any
of
the
MDOS
commands
from
drive
zero.'
Only
th~
MDOS family of system
files that must reside on every
diskette
used
in
an
MOOS
~
environment
will
be
copied.
The
nu"
option is useful in
.
./
generating user diskettes which
are
to
contain
only
data
Page
10-04
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