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Information On "Lost Sector Groups" With Stac |
The information in this document applies to:
WordPerfect® 5.1 for DOS
Problem
Solutions: The following technical note is from Stac Electronics, publisher of Stacker. In brief, customers should NEVER use the /=D switch with CHECK (a Stacker utility). If they do use it, CHECK will report lost sector groups and ask to delete the affected areas. DO NOT let it do so. These lost sector groups are managed and automatically cleared by Stacker when they total more than 6% of the drive. They do not pose any threat to data or program integrity. The full text of the technical note is listed below for further information. Background To be as efficient as possible, Stacker doesn't always completely erase previously used disk space 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 are similar to lost clusters that the DOS CHKDSK command can report, yet are 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 damage 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. |
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