However, the enumeration of sectors starts at 1 (not 0, as for other fields), so the maximum number of sectors per track is 63.īecause all hard disks are low-level formatted with a standard 512-byte sector, the maximum disk capacity described by the partition table is calculated as follows: The Starting Sector and Ending Sector fields are each six bits long, which limits the range of these fields to 0–63. The Starting Head and Ending Head fields are each one byte long, which limits the field range to 0–255. The Ending Cylinder field in the partition table is 10 bits long, which limits the number of cylinders that can be described in the partition table to a range of 0–1,023. ![]() If your disk fails, you need to work with the partition starting point (among other factors) to retrieve stored data. ![]() Knowing the starting sector of an extended partition is very important for low-level disk troubleshooting. The Starting CHS fields for non-active partitions point to the boot sectors of the remaining primary partitions and the EBR of the first logical drive in the extended partition. The master boot code uses these fields to find and load the boot sector of the active partition. These fields are essential for starting the computer. ![]() The Starting and Ending chs (Cylinder, Head and Sector) fields are additional elements of the partition table.
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