| 摘要 |
PROBLEM TO BE SOLVED: To inspect a surface defect of a magnetic disk using continuous recording system, as well as a surface defect of a magnetic disk using discrete track recording system and patterned media recording system, with only one inspection apparatus. SOLUTION: An inspection apparatus compares a signal with a threshold for inspecting a magnetic medium using continuous recording system to detect a surface defect of a continuous recording type magnetic disk, and on the other hand discriminates a data area from a servo area on the basis of a level of the signal obtained by detecting light reflected from the disk surface and performs threshold processing on the signals from each of the areas, to detect a defect of the magnetic disk using discrete track recording or patterned media recording. COPYRIGHT: (C)2011,JPO&INPIT |
