Apparently they discovered that the Sandforce SF-2281 controller has a bug that breaks the AES 256 encryption mode. This chip has been around for a long, long time and only Intel found this bug. Interesting.
http://www.anandtech.com/show/5971/...nt-do-aes256-encryption-offers-return-program
http://communities.intel.com/message/158716#158716
http://www.anandtech.com/show/5971/...nt-do-aes256-encryption-offers-return-program
http://communities.intel.com/message/158716#158716