Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2006-05-09
2006-05-09
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C360S073030, C360S078140, C360S077080, C360S075000, C360S072100, C318S132000, C318S254100, C318S560000
Reexamination Certificate
active
07042668
ABSTRACT:
A method and apparatus for generating an index location from a spin motor of a disk drive are disclosed. A disk drive includes a motor having a plurality of commutation states, wherein changes in commutation states are controlled by an FCOM signal having FCOM pulses. Ideally, when the motor is spinning at a constant speed, the time between FCOM pulses is constant. However, the inventor of the present invention has recognized that, in practice, the time between FCOM pulses, when measured more closely, is not constant due to mechanical tolerances in the motor. Accordingly, the inventor has determined that the non-constant times between FCOM pulses can be advantageously used to generate a spin motor index in a disk drive. Once obtained, the spin motor index may advantageously be used for a number of purposes.
REFERENCES:
patent: 5028852 (1991-07-01), Dunfield
patent: 5254914 (1993-10-01), Dunfield et al.
patent: 5258695 (1993-11-01), Utenick et al.
patent: 5408153 (1995-04-01), Imai et al.
patent: 5442266 (1995-08-01), Morehouse et al.
patent: 5466997 (1995-11-01), Utenick et al.
patent: 5495368 (1996-02-01), Blatchley et al.
patent: 5530326 (1996-06-01), Galvin et al.
patent: 5532926 (1996-07-01), Dunn et al.
patent: 5569990 (1996-10-01), Dunfield
patent: 5729399 (1998-03-01), Albrecht et al.
patent: 5767643 (1998-06-01), Pham et al.
patent: 5821713 (1998-10-01), Holling et al.
patent: 5825145 (1998-10-01), Pham et al.
patent: 5946155 (1999-08-01), Tochiyama
patent: 5982571 (1999-11-01), Calfee et al.
patent: 5995314 (1999-11-01), Furuki et al.
patent: 6229663 (2001-05-01), Yoneda et al.
patent: 6369541 (2002-04-01), Albert
patent: 6560054 (2003-05-01), Ottesen et al.
Figueroa Natalia
Hansra Tejpal S.
Hudspeth David
Maxtor Corporation
LandOfFree
Method and apparatus for generating an index location from a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for generating an index location from a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for generating an index location from a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3624881