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Is there any dependable FOSS that provides hard disk encryption such that a data drive (i.e. not a system drive) can be moved between Linux, OS X and Windows systems, and can be read from and written to on each of those platforms?

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2 Answers

TrueCrypt

Freeware & Source Available disk encryption software for Windows 7/Vista/XP, Mac OS X and Linux. All OS ports actively maintained by the same developers.

If support for Mac OS X is not a criterion, then there is LUKS which is the standard drive encryption solution for Linux. The FreeOTFE project provides support for the LUKS format on Windows.

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Note that for this to fit the OP's requirements, the true crypt volume must be formatted as a file system which all of the platforms support. –  Dan D. Mar 23 '12 at 8:15
    
TrueCrypt is not FOSS. –  sampablokuper Mar 23 '12 at 15:57
    
@sampablokuper thanks... truecrypt is source-available and gratis... it is not an acknowledged libre software in the free-to-redistribute sense... –  user1055604 Mar 23 '12 at 16:41
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Exactly. Gratis, shmatis; I want FOSS :) –  sampablokuper Mar 23 '12 at 17:56
    
Progress on establishing FOSS credentials for TrueCrypt is potentially afoot: istruecryptauditedyet.com –  sampablokuper Dec 3 '13 at 13:30
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The best suggestion I've yet received came from Daniel J. Luke (thanks, Daniel!), who pointed out that EncFS might work. If/when I get around to testing it, I hope I'll remember to report back here :)

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