Disk encryption protects information by encrypting every byte that is written to a HD or virtual disk volume.

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FileVault AES-XTS decryption with cipher text that's missing a part

My mac was recently upgraded to OS X Yosemite and FileVault2 full disk encryption was turned on. Encryption finished, but things went horribly wrong and key parts of the disk are filled with all 0s ...
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Ability to locate free sectors on an encrypted volume

I am trying to understand, generally how could this be a security issue ? Assuming the volume's backing media has this weakness (lets say an NTFS sparse file based TrueCrypt container) what could the ...