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Cylinder-head-sector disk addressing: addressable range, direct use, compatibility issues and conversion between coordinate systems.

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Default (as opposed to physical) read/write heads - what are they?

Modern hard drives are not addressed by Cylinder, Head and Sector (CHS) coordinates, but by Linear Block Address (LBA). … This sectoring scheme began to be used before LBA addressing became the norm, so there was a long interim period in which logical CHS addresses were sent to the drive with no obvious relationship to its …
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