BIOS Geometry Translation
The use of logical hard disk geometry gets around the problem that physical hard disk geometries cannot be properly expressed using simple BIOS
In order to get around these barriers, another layer of translation is often applied on top of the geometry translation that occurs inside the hard disk. This translation is performed by the BIOS (or sometimes, third-party overlay software.)
There are three BIOS Translation Modes: Standard CHS, Extended CHS (ECHS) / Large and Logical Block Addressing.
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