Which of the following parameters is NOT used for calculating the capacity of the hard disk?

Bytes per sector is a direct parameter in the capacity formula, as total capacity equals total sectors multiplied by bytes per sector.

Number of heads is a direct variable in the CHS capacity formula and represents the readable surfaces across all platters.

Total number of sectors is a direct parameter used in the simplified capacity formula: Total Sectors x Bytes per Sector equals total disk capacity.

Hard disk capacity is derived from the CHS formula: Heads x Cylinders x Sectors-per-Track x Bytes-per-Sector, or equivalently Total Sectors x Bytes-per-Sector. The number of platters is a physical hardware attribute that informs the head count (each platter has two read/write heads), but platters themselves are not a direct input parameter in any standard capacity calculation. The CHS addressing model uses heads, not platters, as the direct variable.