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Hi, Phil -- thanks for your post!
Sparse disk images have been around for quite some time, although they're rarely talked about. Apple themselves leveraged sparse images to implement FileVault, so it's been quite well tested. I don't believe they shrink 'automatically', but since FileVault images will shrink, there's likely a command that could be used to compress them. I believe, using a combination of saved settings and our upcoming AppleScript support (see your other question for more), you'll be able to quite easily develop a model that will unmount the sparse image and keep it 'out of mind'...
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--Dave Nanian |
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Shrinking Sparse Images
I use a sparse image to back up and recently noticed that the file size has been growing far beyond the size of the data on the disk image. The sparse image had max size of 7 GB and contained only 4.95 GB of data, but the file size was 6.45 GB!
That seemed unreasonable, so I decided to look into shrinking it. Reading from here, http://www.hmug.org/man/1/hdiutil.html I found the hdiutil command "compact", which can be used in the terminal as follows: Code:
hdiutil compact imagename.sparseimage Quote:
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Yes: sparse images are used for FileVault folders in Panther, and I know that they -- along with lots of other things -- took fixes for Panther (and later releases). But I believe sparse images work quite well as long as you don't get any internal corruption due to crashes and the like...
In any case, I absolutely recommend that people update to Panther. There are a lot of improvements in it, as there will be in Tiger. And we don't guarantee that any version past v2.0 will be Jaguar compatible: we just can't maintain backward compatibility forever -- it constrains new features too much, and makes our testing matrix far, far too difficult to execute.
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--Dave Nanian |
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