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Signal Processing/ Error Correction Code

This is a new coding scheme, jointly developed by the Hitachi San Jose Research Center and Storage Technology division, that allocates extra redundancy to a sector that may be applied to any on sector in a block composed of several sectors. The advantage over a traditional Reed-Solomon code is that some of that checkbytes are not tied to a particular sector. These "floating" checkbytes offer a more efficient use of the disk surface.

Integrated Sector Format-Error Correction Code
•	Motivation is Mixed Random/Burst Mode
•	Multi-Level Integrated Sector Format ECC is
	–	Compatible with Single Sector ECC
	–	Efficient/Flexible use of N-Sector Shared Checks
	–	Include Burst-Level ECC in DRP
•	Hard Disk Controller Implementation
	–	Multi-Level Encoder/Syndrome Generator
	–	LBA-indexed N-Sector Physical Alignment

Disk Surface Defect
fig1

Bathtub Plot

Mixed Burst/Random Error Pattern

Scratch ISF -ECC
(Integrated Sector Format - Error Correction Code)

Integrated Sector ECC Format

Integrated Sector Format

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