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Reduce size of compressed disk images
Authored by: rselph on Jun 09, '03 01:11:51PM

Sparse images aren't that good a solution to this problem anyway.

The problem is that the sparse image disk "driver" doesn't have any knowledge about HFS+, or whatever other filesystem is on the disk. This means that space for deleted files is never reclaimed. Once a disk sector has been touch by the file system for any use at all, it will remain part of the sparse image, even if HFS+ considers the file to be deleted.

Sparse images are really useful for building a compressed image when you're not sure of the total size you will need. But basically it's designed to be used once and thrown away.

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