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TEC042.DOC
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1993-04-06
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__________________________________________________________________________
STACKER NOTE STACKER NOTE
Title: "Lost Sector Groups" and Stacker
STACKER NOTE #042 - 01/20/93 STAC FAX Index #3003
__________________________________________________________________________
Background
To be as efficient as possible, Stacker doesn't always completely erase
previously used disk areas at the moment when an application makes
a file smaller. This happens most often when you run database applications,
which tend to vary the file size a great deal. As a result, the standard FAT
entry shows that data is stored in an area, while the Stacker drive's
extended FAT entry shows the area was deleted and can be reused.
This condition is completely harmless. In the normal course of events, you
won't know it exists and Stacker corrects it automatically.
However, if you happen to run CHECK /=D /F, messages reporting "lost sector
groups" may appear. The lost sector groups similar to lost clusters that the
DOS CHKDSK command can report, yet even less significant since Stacker deals
with them automatically. Lost sector groups do not interfere with the
operation of any programs, not even Microsoft's Access, Borland's
Paradox, or Lotus's Freelance. They do not corrupt any files or threaten any
data. Even though CHECK offers to delete these areas, you should respond
with NO.
Result
Do not use the /=D switch with CHECK. This switch is intended for internal
development purposes only. Lost sector groups are not a problem.
Running CHECK /F does not report or deal with lost sector groups unless they
take up more than 6% of the drive; in that case, it clears the condition.
Running CHECK /=D /F reports all lost sector groups and offers to delete the
areas. Do not let it do this; respond NO if CHECK offers to delete any
area. If you want to clear out lost sector groups for some reason, run
SDEFRAG or choose Stacker Optimizer from the Stacker Toolbox (STAC).
Any choice (Full Optimize, Quick Optimize, or Restack) completely clears
lost sector groups.
___________________________________________________________________________
Copyright 1993, Stac Electronics