Advanced Bios Features - Beckhoff CX50 0 Series Hardware Documentation

IDE Primary Master:
This parameter is used for configuring the IDE bus. The following options are available:
• None (no hard disk connected to this bus connection)
• Auto (auto-detection during each boot process)
• Manual (the hard disk is addressed with the set parameters)
Access Mode:
This option can be used to select the operating system for the hard disk. Setting options: CHS, LBA, LARGE,
or Auto. Auto is the recommended setting. Normal (standard) mode supports hard disks with a capacity of up
to 528 MB. This mode uses positions for data access that are specified via cylinders (CYLS), heads, and
sectors. The older LBA (Logical Block Addressing) mode can support hard disks with a capacity of up to 8.4
GB. This mode uses a different method for calculating the position disk data to be accessed. It translates
cylinders, heads and sectors into a logical address for the data location. Large hard disks support this mode.
The BIOS supports the INT 13h extension function that enables the LBA mode to manage hard disk drives
with a capacity of more than 8.4 GB. If the number of cylinders (CYLs) on the hard disk exceeds 1024 and
DOS cannot support it, or if your operating system does not support LBA mode, LARGE mode should be
selected. The following options are available for setting the hard disk access mode:
• CHS
• LBA
• LARGE
• Auto
The following parameters are automatically determined and displayed.
Capacity
Storage capacity of the hard disk. This value is calculated from the individual hard disk parameters.
Cylinder
Define or set the number of cylinders. Depending on the BIOS version and the manufacturer it varies
between 1,024 and 16,384 cylinders.
Head
Define or set the number of heads. The number is between 1 and 16 heads.
Precomp
Write pre-compensation, required for older hard disks. This parameter specifies the cylinder from which a
difference in the information density is to be expected.
Landing Zone
This parameter defines the so-called landing zone or park cylinder. This is the resting position for the hard
disk head when the hard disk motor is switched off.
Sector
Define or set the number of sectors per track. Up to 63 sectors are supported, for Phoenix up to 64.
4.3.2

Advanced BIOS Features

This menu is used to set the data for the hard disk connected as master to the first IDE bus. The hard disk
data (size, number of cylinders, heads, sectors, pre-compensation and home position of the heads when the
disk is switched off) are displayed automatically for the connected hard disk.
CX50x0 Version: 1.9
Operating/Configuration
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