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Adaptive seek parameter for reserved area and user area access

IP.com Disclosure Number: IPCOM000012971D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-11
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Abstract

Disclosed is new servo control method for Hard disk drives, which provide reliable seek and track following operation. hard disk user require both high performance and reliable Drives. Hard disk Drive moves actuator as fast as possible by applying high current to Voice Coil motor to achieve high performance. and the more Hard disk apply

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Adaptive seek parameter for reserved area and user area access

Disclosed is new servo control method for Hard disk drives, which provide reliable

seek and track following operation. hard disk user require both high performance and

reliable Drives. Hard disk Drive moves actuator as fast as possible by applying high

current to Voice Coil motor to achieve high performance. and the more Hard disk apply

energy, the more frequently actuator can make a oscillation which is caused by

mechanical resonance. Servo control parameter set enough margin to make reliable

seek. but if environment like temperature and voltage change to bad condition,margin

gets narrower. As for seek time, seek complete criteria is one factor which decides

performance. if seek complete criteria is tighten, seek time gets shorter. But the

possibility which data is written at off track position increase.

Disk drive has user area and reserved area on Disk User area contains user data and

can be accessed by read/write command. Reserved area stores special data such as

defect list, error log , Drive unique parameter. and this area also used by head test on

POR process and error recovery procedures. if Drive failed to read reserved area on

POR process, drive get unready status. So reserved area should be written more reliable.

   This method prepare two seek parameter. one is normal high performance seek parameter. high performance parameter make a high speed control to actuator. seek

complete criteria is o...