World Smallest Hard Drive 0.8 inch, 8GB, 2 Grams
Toshiba develops world's smallest Hard Drive, 0.85 inch, 8GB weighs 2 Grams.
Toshiba's Hard Drive is the World's Smallest Hard Drive, it is 0.85 inches (2.159 cm) and weighs only 2 Grams (0.0044 lb). There is no other information available just the picture.
I think with this miniaturization, you can expect your mobile phone, PDA, Smartphone to be smaller and also have more memory.