Can anyone recommend a program or method of stress testing hard drives? I check memory/cpu with memtest86, but I would like some way to stress test a hard drive. Currently I dd urandom over it for a few days or DBAN it, but I'm looking for something more thought out. Preferably, a program that can run on a live system so I'd just attach the drive to be tested, and point the test at /dev/sdd or whatever dev it was on. Preserving data on the drive is (obviously) not a concern.