BAD BLOCK SCAN TEST: reads each block on the disk and fails if the drive reports an error while reading a block. This test should always be used to verify that a drive is functioning properly. This test will attempt to remap any bad blocks it encounters.
RANDOM SEEK TEST: reads blocks on the disk in a random order. This test is used to test the drive's seek mechanism.
EXTERIOR TRACK SEEK TEST: also tests the drive's seek mechanism. This test seeks the drive's exterior track from locations progressively nearer the center of the disk.
INTERIOR TRACK SEEK TEST: seeks the drive's interior track from locations progressively nearer the outside of the disk.
WRITE TEST: tests the drive's write mechanism. Data is written to random sectors on the disk. The test then reads the data to ensure it matches what was written.
