This study performed an automated cut off DC power directly to the drive -- which seems reasonable to me - and is more practical for testing, and I personally l

This study performed an automated cut off DC power directly to the drive -- which seems reasonable to me - and is more practical for testing, and I personally like that it's testing the hard drive as a more "self-contained" unit. Power fault often occur at the AC power, however, and only later gets to the DC power. This is impractical to test as there are too many configurations/variables and it's much harder to test accurately, but it would theoretically be interesting to see if AC power faults to a system power supply had a different affect on the data than DC power faults.