Data General was one of the first PC manufacturers to use the then-new IDE drives. It was my job to ensure that the new interface was 100% compatible. I also rigged a power-cycle test. It had an external box that the computer plugged in to (110VAC) and the parallel ports were connected. The computer powered up, did self-test, booted from the floppy, and sent a command out the parallel port to power off the machine. A fixed interval later, the machine powered back on again. The first four drives I tested failed this test.