Not since the Ground Round instituted their “pay what you weigh” has a weight been taken so literally. Concrete has 1001 uses and now it can be a USB flash drive too. But with a twist, natch. These drives are to be designed such that the weight of the concrete block (in grams) is the same as the drive’s capacity. So that 256 GB drive weighs 256 grams, or about half a pound. Not quite heavy enough to discourage someone from walking off with your drive but maybe if you got one that was a few terrabytes, you’d have the geek equivalent of the gas station bathroom key on a cement block.