It is classified as „On The Fly Encryption’ (OTFE) software, which basically means that it encrypts and decrypts files as you access and modify them and that all files within the area of encryption are available as soon as you enter the key.
TRUECRYPT OLD VERSION MAC OS X
TrueCrypt is a free, cross-platform program (meaning that it works in Windows, Mac OS X and Linux distributions including Ubuntu) that you can use to encrypt your data. While this decrease is imperceptible when working with a few small files, working with thousands of tiny files or a few really big ones will take significantly longer as each file is decrypted before it can be used. While it’s nowhere as dire as losing the files forever, another disadvantage of encryption is that you will lose some read/write performance when working with encrypted files (that is, opening files, saving them and/or moving them around). Once that data is encrypted and you lose the key you might as well have securely deleted the files, and you’re not getting them back. The problem: if you’ve forgotten the password that includes you too. Encryption is great at keeping people without the decryption key out. Unfortunately, encryption’s strength is also its weakness. Unless the person happens to know the decryption key (which is highly unlikely), you might as well have already securely erased the drive. The great thing about data encryption is that, without the key for decryption, the data appears as random noise. When you sell your computer (or dispose of it by other means), it’s always a good idea to make sure that your data is securely erased to prevent the recovery of deleted files by whoever comes across the computer next.
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