Disk and tracking precision measuring method null for tracking precision measurement of

摘要

PURPOSE:To attain the objective evaluation of tracking precision of a magnetic disk device by using a test use recording medium recorded with a servo burst signal for positioning recorded at nearly equal interval in the circumferential direction and with a burst signal for measuring position error between the servo burst signals. CONSTITUTION:A test use recording medium 1' is used, in which a servo burst signal recorded for positioning at nearly equal interval in the circumferential direction and a burst signal for measuring position error recorded between the servo burst signals are recorded, to measure the tracking performance of a magnetic disk device (FDD). That is, the test medium 1' is used for the FDD to be measured and the servo burst signal for positioning is used for tracking control, a position error measuring device 9 detects the position error measuring burst signal to measure the tracking precision. Thus, a common off-track measuring device can evaluate and measure the tracking precision of each FDD objectively.