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Chapter 7: BIOS
7-5
Primary IDE Master/Slave, Secondary IDE Master/Slave
From the Advanced Setup screen, press <Enter> on the appropriate option to
access primary and secondary IDE master and slave drives submenu. Use this
screen to select options for the Primary and Secondary IDE drives. Use the up
and down <Arrow> keys to select an item and the <Plus> and <Minus> keys to
change the value of the selected option.
Type
Select the type of device connected to the system. The options are "Not In-
stalled", "Auto", "CDROM" and "ARMD".
LBA/Large Mode
LBA (Logical Block Addressing) is a method of addressing data on a disk drive.
In LBA mode, the maximum drive capacity is 137 GB. For drive capacities over
137 GB, your system must be equipped with 48-bit LBA mode addressing. If not,
contact your manufacturer or install an ATA/133 IDE controller card that supports
48-bit LBA mode. The options are "Disabled" and "Auto".
Block (Multi-Sector Transfer)
Block mode boosts IDE drive performance by increasing the amount of data
transferred. Only 512 bytes of data can be transferred per interrupt if block mode
is not used. Block mode allows transfers of up to 64 KB per interrupt. Select
"Disabled" to allow the data to be transferred from and to the device one sector
at a time. Select "Auto" to allows the data transfer from and to the device occur
multiple sectors at a time if the device supports it. The options are "Auto" and
"Disabled".
PIO Mode
IDE PIO (Programmable I/O) mode programs timing cycles between the IDE drive
and the programmable IDE controller. As the PIO mode increases, the cycle time
decreases. The options are "Auto", "0", "1", "2", "3" and "4". Select Auto for
BIOS to auto detect the PIO mode. Use this value if the IDE disk drive support
cannot be determined. Select 0 for BIOS to use PIO mode 0, 1 for PIO mode 1,
2 for PIO mode 2, 3 for PIO mode 3 or 4 for PIO mode 4. These settings have
data transfer rates of 3.3 MBs, 5.2 MBs, 8.3 MBs, 11.1 MBs and 16.6 MBs,
respectively. This setting generally works with all hard disk drives manufactured
after 1999. For other disk drives, such as IDE CD-ROM drives, check the speci-
fications of the drive.