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US 9,312,886 B2Granted
Storage device with multiple coding redundancies
AssigneeSeagate Technology LLC
InventorsAra Patapoutian, Deepak Sridhara, Zheng Wang, Jason Charles Jury
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Abstract
A storage device is configured to utilize different encoding and decoding schemes in reading and writing data to different regions of a storage device based on the position of the storage regions and/or component-specific physical characteristics of the regions. Each encoding scheme may include multiple different types of encoders selected based an optimization process for each region.
Claims15
A method comprising:
- selecting different modulation codes for use in different regions of a storage medium, a modulation code with a lower code rate being selected for use in a region of higher channel bit density and a modulation code with a higher code rate being selected for use in a region of lower channel bit density.
An apparatus comprising:
- a microcontroller configured to select a first modulation encoder for encoding data on a first surface of a storage medium based on a channel bit density of the first surface and to select a second different modulation encoder for encoding data on second different surface of the storage medium based on a channel bit density of the second different surface.
An apparatus comprising:
- a microcontroller configured to:
- select a first track-based ECC encoder for use in a first region based on a radial location of the first region;
- and
- select a second different track-based ECC encoder for use in a second region based on a radial location of the second region, wherein the first track-based ECC encoder creates fewer parity sectors than the second different track-based ECC encoder, and the first region is closer to an inner diameter of the storage medium than the second region.
1 more element
Dependencies are inferred from the claim text.