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[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System BIOS | BIOS Settings | IDE Device Setup / Autodetection ]


This setting indicates the size of the drive, normally in decimal megabytes. This actually isn't really a "setting" per se, since you don't normally enter this value. It is calculated according to the following formula:

  • Size = (Heads * Cylinders * Sectors * 512) / 1,000,000

The 512 is because PCs use 512-byte sectors; the 1,000,000 converts the number to decimal megabytes. The number of heads, cylinders and sectors in this formula is equal to whatever the settings are in the BIOS.

Next: Cylinders

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