The Marshal Corporation of Japan has launched a hard drive case, the MAL-0325S. The portable HDD case of USB connection and IDE interface easily absorb the impact shock, thereby protecting the hard drive. It can withstand a fall of 1m, so you don’t have to worry about losing the data when the drive falls on the ground.
Weighting about 60g (of course without including the drive), it measures 84×127×23mm. The HDD case is priced at $16 and is now available.