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Store files securely on a USB flash drive
Authored by: michaelbach on Aug 04, '06 08:05:59AM

Good tip. Since I've been doing likewise for quite a while, I've encountered some of the possible snags:
(1) the sparseimage can only grow to the maximum size entered initially, so I would use a slightly larger size than that memory stick to begin with.
(2) if you pull out the stick without having unmounted first the image, and then the stick itself, it is highly likely that you corrupt that dmg file and you loose _everything_ in it in one fell swoop.
Finally: I do not see the need to reformat the drive, the dmg can also reside in a DOS formatted file system.



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Store files securely on a USB flash drive
Authored by: jeaginsky on Aug 04, '06 10:09:09AM

i set this up in conjuction with another simple hint on-site to use digital photographs instead of scanning of important documents. putting a folder of these on a password protected flash drive is a good earthquake/emergency kit addition, as seen in the red-tape aftermath on 9/11 and katrina...



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Store files securely on a USB flash drive
Authored by: tbucks on Aug 04, '06 02:15:25PM

Do you have the link for the hint about using digital photographs instead of scanning of important documents ?



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Store files securely on a USB flash drive
Authored by: moritzh on Aug 04, '06 12:10:53PM

(1): The problem is that DiskUtility limits the size of the sparse image to the available free space on the volume (USB key drive) where the image is to be saved (which can be at most as much as the size of the volume). So you either have to start with a totally empty volume to be able to create an image with that size, or you have to create the image on another volume with more space free and then move it to the key once it's created.

(2): That's right, be very aware of that. You should always have a backup of your important data. Believe me, it's very frustrating to see the encrypted image rendered useless beyond repair because it had not been unmounted properly.



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Store files securely on a USB flash drive
Authored by: BrentT on Aug 04, '06 03:39:41PM

I suggested reformatting to MacOS as an extremely weak extra security measure. If the drive is found by a PC user and puts it in a Windows machine the drive won't be recognized and the user will asked to reformat the drive, erasing the dmg file.



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