Head protection circuit of hard disk drive

Details Head protection circuit of hard disk drive Head protection circuit of hard disk drive

2007-09-18

2007-09-18

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S067000

Reexamination Certificate

active

11060498

ABSTRACT:
A head protection circuit that protects a write head and a magnetoresistive (MR) read head by bypassing electrostatic charge applied to the write head when the power of a preamplifier is turned “off” includes: a first differential mode switch and a first differential mode resistance connected between each end of the write head; and a first common mode switch and a first common mode resistance connected between one end of the write head and a ground potential. The first differential mode switch and the first common mode switch installed in the preamplifier are turned “on” when the preamplifier is turned “off” and vice versa. The head protection circuit has an effect of protecting the write head and the MR read head by bypassing common mode electrostatic charge and differential electrostatic charge generated at the ends of the write head when the preamplifier is turned “off.”

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