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Wake up a MacBook that likes to sleep in
Authored by: wastemytime on Oct 08, '07 08:07:57AM

While early versions of FileVault may have been susceptible to the corruption you fear, you should be aware that Apple quietly introduced a new version of it in Mac OS X 10.4.7 last year.

In earlier versions, the sparseimage's headers were written at the end of the file (they should've been called trailers then), so, if there was a problem writing or compressing the image, it could easily be corrupted.

With the 10.4.7 update, they introduced a new version of sparse disk images so the headers are at the beginning (appropriately enough), making them much more resistant to failure.

The catch is, if you created your FileVault with an earlier version, it continues to use the old, more fragile format. The solution is to just turn FileVault off, then turn it on again (probably using the secure erase option). The new FileVault will use the new format.



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Wake up a MacBook that likes to sleep in
Authored by: zarqman on Oct 08, '07 10:14:50AM

very interesting. unfortunately, it's still not enough. i corrupted a filevault image after one too many crashes on my macbook (all related to fast-user-switching and an external lcd it seems) just a couple of weeks ago.



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Wake up a MacBook that likes to sleep in
Authored by: vocaro on Oct 08, '07 10:17:32AM

DiskWarrior 4 claims to be able to repair corrupted FileVault images.



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Wake up a MacBook that likes to sleep in
Authored by: Peter Kappesser on Oct 08, '07 01:19:06PM

Interesting revelation about the improved sparseimage format -- does that apply to non-FileVault sparse images as well? I use several for things like financial info, etc. so I should convert them to the new format if so.

Re: the main topic -- my PowerBook G4 sometimes has this issue, but I don't use any Microsoft applications. Most often the only thing running is Safari, with a lot of tabs open (I load up with my daily assortment of web sites to read on my break at work without a net connection). Same solution, just close the lid, wait for the sleep light to pulse, and reopen it to try again. Maybe it's related to virtual memory swapping for apps that are using a lot of memory?



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Wake up a MacBook that likes to sleep in
Authored by: wastemytime on Oct 08, '07 08:33:22PM

AFAIK, this applies to all encrypted sparse disk images. If you have such an image you created before 10.4.7, you might want to create a new one and copy everything over.



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