If you want to make sure your data is safe from the NSA and anyone else, then you may want to have a look at Autothysis128t Solid State Drive.
The secure hard drive comes with 256-bit AES hardware level encryption, and it features a pin code system, and two factor authentication, it also comes with a built in GSM module.
The drive is capable of self destructing if the pin is input too many times, or if it is disconnected from your computer, you can also decide to self destruct the drive yourself by sending a text message to it.
The Drive has built in GSM with the capability of physical data destruction on demand. It is the first SSD Drive in the world to offer remote fragmentation of the NAND Flash storage within the Drive. This patented technology is designed to fragment the NAND Flash along with the security controller to impede any data recovery technique that might be applied in an attempt to gain access to the encrypted data. No amount of computer processing power will help if a NAND Flash can’t be mounted onto a PCB. The whole design approach of this Drive was based on reverse engineering data recovery techniques.
You can find more details about this self destructing SSD over at Securdrives, it isn’t cheap though, the 128GB model will set you back £1,027 which is around $1,650.