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US 7,072,132 B2Granted
System and method for writing servo track in sealed HDD
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsDavid Flynn, Gary Herbst
Life of this patent
Estimating the term…
Abstract
Write control bits are associated with servo pattern data bits to selectively disable or enable a write gate in a HDD write channel for self-servo writing after being sealed but before being vended to a user. The write gate can be disabled and enabled without deenergizing the write channel. A single write delay is calculated from one timing mark to the next to enable writing the next timing mark and portions of the radial pattern and servo pattern between the timing marks.
Claims5
A HDD comprising:
- at least one write channel including at least one write gate;
- and
- control circuitry controlling the write gate using write control bits to selectively enable writing data bits associated with a servo pattern onto at least one disk, wherein the control circuitry uses tow bits of a ten bit parallel bus as write control bits to indicate whether the write gate should enable writing one or more of the remaining eight bits of the bus to disk.
A HDD comprising:
- at least one write channel including at least one write gate;
- and
- control circuitry controlling the write gate using write control bits to selectively enable writing data bits associated with a servo pattern onto at least one disk, wherein the control circuitry uses four bits of an eight bit parallel bus as write control bits to indicate whether the write gate should enable writing one or more of the remaining four bits of the bus to disk.
Dependencies are inferred from the claim text.