Intel 273246-002 manual Configuring IDE Drive Types, IDE0-IDE3 Drive Assignments

BIOS Quick Reference

5.3.3Configuring IDE Drive Types

If true IDE disk file systems (and not their emulators, such as ROM, RAM, or flash disks) are mapped to drive letters, then the IDE drives themselves must be configured in this section. The following table shows the drive assignments for Ide0-Ide3:

Table 5-1. IDE0-IDE3 Drive Assignments

File System Name	Controller	Master/Slave
Ide0	Primary (1f0h)	Master
Ide1	Primary (1f0h)	Slave
Ide2	Secondary (170h)	Master
Ide3	Secondary (170h)	Slave

To use the primary master IDE drive in your system (the typical case), just configure Ide0 in this section, and map Ide0 to drive C: in the Configuring Drive Assignments section.

The IDE Drive Types section lets you select the type for each of the four IDE drives: None, User, Physical, LBA, or CHS.

User	This type allows the user to select the maximum cylinders, heads, and sectors
	per track associated with the IDE drive. This method is now rarely used since
	LBA is now in common use.
Physical	This type instructs the BIOS to query the drive’s geometry from the controller
	on each POST. No translation on the drive’s geometry is performed, so this type
	is limited to drives of 512 Mbytes or less. Commonly, this is used with
	embedded ATA PC Cards.
LBA	This type instructs the BIOS to query the drive’s geometry from the controller
	on each POST, but then translate the geometry according to the industry-
	standard LBA convention. This supports up to 16-Gbyte drives. Use this method
	for all new drives.
CHS	This type instructs the BIOS to query the drive’s geometry from the controller
	on each POST, but then translate the geometry according to the Phoenix CHS
	convention. Using this type on a drive previously formatted with LBA or
	Physical geometry might show data as being missing or corrupted.

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