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Definition: hard disk configuration

Following are the parameters stored in a PC's BIOS setup memory that describe the configuration of the hard disks in the system. SCSI hard disks are usually not identified in the setup memory.

Hard Disk Types
There are 46 hard disk types, numbered 1 to 46, that include all the required parameters below. Since they cover earlier drives that only go up to 152MB, the user-configurable Type 47 is usually chosen and the remaining parameters are entered manually or are automatically detected (all new drives are detected).

 CYLINDERS  Number of cylinders.

 HEADS      Number of read/write heads.

 WPCOM      Write precompensation track.

  ZONE      Cylinder for parking heads.

 SECTORS    Sectors per track.

 CAPACITY   Total capacity derived from
             above parameters (heads X
             cylinders X sectors X 512)