Defragmenting a Volume Containing Shadow Copies

Defragmenting the source volume causes the difference file to increase. If the difference file increases beyond the allocated space, you might lose previous versions of some files. Even with a 16 KB cluster size, the shadow copy difference file will increase. If the difference increases too much (greater than the maximum set), shadow copies will be deleted.

If you do not have to keep shadow copies, delete them before defragmenting to improve the performance of the defragmentation. See "Deleting a Shadow Copy."

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Dell 745N manual Defragmenting a Volume Containing Shadow Copies
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