| 摘要 |
PURPOSE:To prevent malfunction by preventing a write succession point and the lost head part of next write data from overlapping each other by setting issue timing points of an automatic erasing operation start instruction on the basis of a defect stand-by instruction and using them selectively. CONSTITUTION:When a controller 2 detects a corresponding track, a CPU1 reads defect information on the track and when the number of defects is 0, the CPU generates an automatic erasure intruction at normal timing T0 after writing or reading final data and escapes from the charge of control. When the number of defects is 1, the CPU generates the automatic erasure instruction at timing corresponding to T1>=td1+tc+T0 obtained by adding time td1 corresponding to the width of a defect area and the width tc of a count part and leaves the charge of control. When the number of defects is >=2, the automatic erasure instruction is generated at timing corresponding to Tn>=td1+td2+...+tdn+ntc+ T0 provided that the time for >=2 defect areas is td2+...+tdn.
|
