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1992-11-11
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___________________________________________________________________________
STAC FAX STAC FAX
SUBJECT: Write-Protected Stacker Drives.
STACKER NOTE TEC035 - 6/10/92 STAC FAX Index #2701
___________________________________________________________________________
Background.
When file corruption such as a damaged temp file is detected, Stacker will
write-protect the drive as a means of safeguarding data. This forces the
user to run Stacker's SCHECK /F, to repair logical data structures before
anything else can be written to the drive. Stacker will also write
protect a mounted drive if it has not been "padded" to its full size. The
fix for this condition involves the SCREATE program and is discussed in
greater detail in section #3.
Procedures.
1. Fixing Errors with SCHECK /F.
SCHECK is similar to the DOS CHKDSK program in that it checks for and
repairs allocation unit errors. Unlike CHKDSK and its work at the DOS
cluster level, SCHECK will diagnose and repair at the sector level.
Stacker's ability to store on a sector-by-sector basis makes this a
necessity. Because SCHECK only repairs sector allocation errors, it will
recommend using CHKDSK to fix any DOS cluster allocation errors that it
has detected. Sometimes SCHECK will offer to delete damaged files.
It is able to do this even though the drive is write-protected. If it
offers to do this, make a backup copy of the file and let SCHECK then
delete it. After SCHECK has made its repairs, the write protection may
then be removed by rebooting or by unmounting then re-mounting the drive.
2. Forcing SCHECK to remove the write protection.
DOS errors can be repaired by CHKDSK or another disk repair utility such
as Norton Disk Doctor or PCTOOLS Diskfix. Because SCHECK will not repair
all DOS errors, it may be necessary to force SCHECK to remove the write
protection before one of these utilities may be used. This should ONLY
be done AFTER SCHECK /F has repaired any Stacker errors. Remove the
write protection by typing: SCHECK /=W D: where D: is the
write-protected drive.
NOTE: DO NOT use this option if the Stacker drive has been mounted as
(SIZE MISMATCH) (Write-Protected). See section #3.
3. Repairing a (Size-Mismatched), (Write-Protected) Drive.
Stacking a drive is a three step process. First, construction of the
Stacker drive companion file (STACVOL.DSK) begins as compressed files are
copied into it. After all the files have been added, Norton Speedisk is
run to defragment this file and optimize the host drive. The last step
is to "pad" the file (add the free space). If the process halts for some
reason, such as Speedisk discovering a bad sector or someone tripping
over the power cord, the Stacvol file will be undersized. Upon reboot,
as the drive is mounted, the message (Size Mismatched) (Write Protected)
will be displayed. In order to continue where Speedisk left off and pad
the file, it is necessary to use the Screate program as follows:
NOTE: Insert the Stacker program diskette and issue these commands from
the floppy drive prompt. If you are using the 5.25" Stacker disk
set, use the Program Disk (Disk #1).
1. Unmount the Stacker drive by typing: Stacker -C:
C: is the letter of the drive you wish to unmount.
2. Run SCREATE D: /P
Where D: is the letter of the host drive containing
the Stacvol file.
3. After receiving the message "Volume Created Successfully" ,
reboot to mount the drive.
___________________________________________________________________________
Copyright 1992, Stac Electronics STAC FAX (619) 431-6712