The Starting and Ending Sector field is 6 bits long, limiting its range to 0 – 63. The Starting and Ending Head fields are one byte long, which limits this field to the range 0 – 255. The Ending Cylinder field in the Partition Table is ten bits long, which limits the maximum number of cylinders that can be described in the Partition Table to 1024.
The code in the Master Boot Record uses these fields to find and load the Partition Boot Sector. On x86-based computers, the Starting and Ending Head, Cylinder, and Sector fields on the startup disk are very important for starting up the computer. Contents Starting and Ending Head, Sector, and Cylinder Fields
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