Magnetic data embedding apparatus having checking function

Details Magnetic data embedding apparatus having checking function Magnetic data embedding apparatus having checking function

2005-10-11

2005-10-11

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S069000, C360S077020, C360S077050, C360S077080, C360S078140, C360S075000

Reexamination Certificate

active

06954318

ABSTRACT:
Rotary positioners integrally and pivotally stack a read magnetic head for reading a master disk and servo heads for writing to each surface of magnetic disks, the master disk and magnetic disks being stacked on a shaft of a spindle motor. Every surface of every magnetic disk is written by the servo heads in parallel while sharing a range of tracks. Simultaneously with the writing, checking magnetic heads stacked on a checking-dedicated rotary positioner read written data on the master disk and on each surface of the magnetic disks. A comparison logic circuit compares the read data from the magnetic disk surfaces with the data from the master disk. If an inconsistency is found, the contents of the master disk are overwritten on the corresponding magnetic disk surface through a correction servo pattern generator by the checking magnetic head.

REFERENCES:
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patent: 2003/0137765 (2003-07-01), Yamazaki et al.
patent: 2005/0073762 (2005-04-01), Sato et al.
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patent: 2001-216750 (2001-08-01), None

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