Reduced recovery time for perpendicular recording systems
AssigneeAgere Systems Inc.
InventorsDaniel J. Dolan, Jr., James P. Howley, Zachary Keirn, German Feyh, Michael P. Straub
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Abstract
User data is read from a medium having servo data and user data encoded thereon. The user data is read with a read/write head that is operable in a write mode and a read mode. Servo data is read in a time window following a transition from write mode to read mode, with a frequency passband that has a first low frequency corner. User data is read from the medium after expiration of the time window, with a frequency passband that has a second low frequency corner that is lower than the first low frequency corner.
Claims20
A method of reading user data with a read/write head that is operable in write mode and read mode from a medium having servo data and user data encoded thereon, the method comprising:
- reading servo data from the medium in a time window following a transition from write mode to read mode, the reading of servo data being performed with a first frequency passband that has a first low frequency corner;
- and
- reading user data from the medium after expiration of the time window, the reading of user data being performed with a second frequency passband that has a second low frequency corner that is lower than the first low frequency corner.
A preamplifier circuit for use in a perpendicular recording system that includes a read/write head that is operable in write mode and read mode and a medium that includes servo data and user data encoded thereon, the preamplifier circuit being configured to control operations of the read/write head to:
- read servo data from the medium in a time window following a transition from write mode to read mode, the reading of servo data being performed with a first frequency passband that has a first low frequency corner;
- and
- read user data from the medium after expiration of the time window, the reading of user data being performed with a second frequency passband that has a second low frequency corner that is lower than the first low frequency corner.
A perpendicular recording system comprising:
- a read/write head that is operable in write mode and read mode;
- a medium that includes servo data and user data encoded thereon;
- and
- a preamplifier circuit operatively coupled to the read/write head, ht preamplifier circuit controlling operations of the read/write head to:
- read servo data from the medium in a time window following a transition from write mode to read mode, the reading of servo data being performed with a first frequency passband that has a first low frequency corner;
- and
- read user data from the medium after expiration of the time window, the reading of user data being performed with a second frequency passband that has a second low frequency corner that is lower than the first low frequency corner.
Dependencies are inferred from the claim text.