Storage

Principles of Operation for Shingled Disk Devices

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Executive Summary

A leading strategy for driving the areal density of magnetic disk drives through 1 - 10 terabit/inch (the coming decade) is to shingle (partially overlap) adjacent tracks, imposing significant restrictions on where data can be written without incurring multi-track read-modify-write penalties. These restrictions and penalties can be fully hidden from system software using techniques familiar in NAND Flash disks; minimally exposed as multi-track, shingled bands of predetermined size that can be read normally, but only appended to or trimmed (erased); or maximally exposed as dynamically sized bands of shingles separated by guard regions of previously erased tracks, allowing maximal capacity to be obtained by the most sophisticated system software.

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