American Megatrends MegaRUM, User Manual

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MegaRUM PCI Motherboard User’s Guide 48
Standard Setup,
Continued
Entering Drive Parameters You can also enter the hard disk drive parameters. The drive
parameters are:
Parameter Description
Type The number for a drive with certain identification
parameters.
Cylinders The number of cylinders in the disk drive.
Heads The number of heads.
Write
Precompensatio
n
The actual physical size of a sector gets
progressively smaller as the track diameter
diminishes. Yet each sector must still hold 512
bytes. Write precompensation circuitry on the
hard disk compensates for the physical difference
in sector size by boosting the write current for
sectors on inner tracks. This parameter is the
track number on the disk surface where write
precompensation begins.
Landing Zone This number is the cylinder location where the
heads normally park when the system is shut
down.
Sectors The number of sectors per track. MFM drives
have 17 sectors per track. RLL drives have 26
sectors per track. ESDI drives have 34 sectors per
track. SCSI and IDE drives have even more
sectors per track.
Capacity The formatted capacity of the drive is the number
of heads times the number of cylinders times the
number of sectors per track times 512 (bytes per
sector).
Cont’d