| 摘要 |
PURPOSE:To prevent writing to a wrong sector and destructs an old data, by discriminating whether a sector to be written is a sector at a rationally correct position before writing operation. CONSTITUTION:For writing operation, a control circuit 26 sets a track and a sector address in registers 17 and 18 respectively. The output 11 of the register 17 is used as a track address signal to select a track of a disk drive 3. The output of the sector address register 18 is supplied to two address converters 21 and 22. The address converter 21 outputs the value of a sector address N-2 which is two addresses before an address N on the track, and the address converter 22 outputs a sector address N-1 which is one address before. Prior to the writing, reading operation is performed firstly and sector addresses are collated according to a prescribed flow. Namely, the address of two succeeding sectors are confirmed to start the writing operation. |
