Comments on: Snow Leopard’s “Disk Utility” can’t create encrypted image http://bergs.biz/blog/2009/12/06/snow-leopards-disk-utility-goofs-up/ Just another WordPress weblog Fri, 10 Sep 2010 06:49:40 +0000 http://wordpress.org/?v=2.5.1 By: Administrator http://bergs.biz/blog/2009/12/06/snow-leopards-disk-utility-goofs-up/#comment-24378 Administrator Wed, 30 Dec 2009 08:33:27 +0000 http://bergs.biz/blog/?p=83#comment-24378 @James: I'm not sure whether what you write is actually true. Remember that I just changed the <em>image type</em> (from <code>encrypted</code> to <code>compressed</code>), and <em>that</em> made it work! In both cases, the final size of the image was not known in advance (because you can't predict the "output" size of encrypted or compressed data, usually compression occurs before encryption is applied). Mind you, I did <em>not</em> change the <em>filesystem</em> of the target drive! @James: I’m not sure whether what you write is actually true.

Remember that I just changed the image type (from encrypted to compressed), and that made it work!

In both cases, the final size of the image was not known in advance (because you can’t predict the “output” size of encrypted or compressed data, usually compression occurs before encryption is applied).

Mind you, I did not change the filesystem of the target drive!

]]> By: James http://bergs.biz/blog/2009/12/06/snow-leopards-disk-utility-goofs-up/#comment-24338 James Mon, 28 Dec 2009 21:28:00 +0000 http://bergs.biz/blog/?p=83#comment-24338 I encountered the same error while trying to backup my existing installation prior to installing Snow Leopard. The problem, I found, was the MS-DOS formatting on the USB drive and when I reformatted it with HFS+, the error went away. I suspect its memory mapping a file of the size necessary for the image, which due to file size limitations on the file system is returning and error but as its a size error on a memory mapping its interpreted as a memory error not a file size error. Hooray FAT32. I encountered the same error while trying to backup my existing installation prior to installing Snow Leopard. The problem, I found, was the MS-DOS formatting on the USB drive and when I reformatted it with HFS+, the error went away. I suspect its memory mapping a file of the size necessary for the image, which due to file size limitations on the file system is returning and error but as its a size error on a memory mapping its interpreted as a memory error not a file size error. Hooray FAT32.

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