公开(公告)号：SG46480A1

公开(公告)日：1998-02-20

申请号：SG1996004997

申请日：1994-12-16

Applicant: IBM

Inventor： NAKAMURA TAKASHI ,  MUMATA TSUTOMU ,  OGASAWARA KENJI ,  KIGAMI YUJI ,  KURACHI KOJI ,  OKADA MAYUMI ,  MATSUI TAKAO ,  YOKOE YUJI

IPC: G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  G11B19/02 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.