Enter these self-destructing hard drives from London-based data security specialists SecureDrives, which appear to be ordinary storage devices on the surface, but are capable of destroying onboard data when triggered by a simple SMS message.
The 2.5-inch drives pack a 128 GB SSD and connect to a computer externally via Micro USB or internally via SATAII. If you're using these gigabytes to store sensitive information and the device happens to fall into the wrong hands, then the in-built GSM module allows the data to be permanently erased in a number of ways.
A user-defined SMS "kill message" is sure to be the most satisfying, if you can fend off the bad guys and peel back your black leather spy gloves for long enough to type it out. Failing that, the drive can be programmed so that the process is initiated by low battery levels, excessive incorrect pin code entries, simply removing the drive from a PC or the loss of a GSM signal for a user-defined period of time.