I just made a disc image copy of a large data partition on my iBook using Carbon Copy Cloner. The resulting image had a label "sparse image".
Does this mean the data is: Sparse (adj) to scatter; thinly spread or distributed; not dense or crowded.
Possibly uncompressed? I thought all disk images are compressed.
I believe that means that those disk data blocks that are not allocated (the free space) has no actual storage. If you were to later write new data to that disk then more space would be added to the image file. This is not the same as compressed. Usually compressed disk images are only used for Read Only images. It takes time to do the compression but the decompression is pretty quick.
Disk images aren't usually 100% full because it's hard to gauge exactly how much space you'll need in advance.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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