公开(公告)号：JPH06231552A

公开(公告)日：1994-08-19

申请号：JP28853893

申请日：1993-11-17

Applicant: IBM

Inventor： JINNEDEIN BUUTAGOO ,  DANA HENRII BURAUN ,  KEBUIN JIYATSUKU ERITSUKUSON ,  RICHIYAADO GURIINBAAGU

IPC: G11B21/10 ,  G11B5/596 ,  G11B20/10 ,  G11B21/08

Abstract: PURPOSE: To improve the demodulation of the digital servo signal of a disk file by identifying a servo burst timing window by a PRML data channel, accumulating plural detected digital samples, and processing it by a servo processor. CONSTITUTION: A signal from an R/W head is amplified by a preamplifier 52, and a read back signal including servo information and the data is extracted by a PRML channel 54, and transmitted to a hard disk controller(HC) 56. The HC 56, a bus IF 58 connected with a host adapter, and an IF processor 60 connected with the bus IF 58 are connected with each other, and an IF processor function is executed by the processor 60. Also, a servo processor 62 operates servo control by supplying servo positioning and motor control signals to VCM and spindle drivers 64 and 66. Moreover, a servo logic 68 inputs phase information to the processor 62 by information from the channel 54. Thus, the demodulation of a digital servo signal can be improved.