SMC Networks SpacePC 1232 Series - Manual (Page 52)

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ATAPI unit type
Option Description Note
None (*) No unit selected Default setting for both
ATAPI Units (Master1 &
Slave1)
(*) = Default setting
Auto Unit auto-detection
LBA LBA unit selected
CHS CHS unit selected
CD-ROM CD-ROM unit selected
Other Other unit selected
• Note: when the Auto feature is selected, the BIOS ignores any other data (like Mode, Cyls,
Head, etc.). Use this option for the most of hard disks or other ATAPI devices.
• Note: LBA and CHS are two different types of ATAPI units addressing mode. The first one is
normally used with modern hard disk, from 512 Kbytes to above 8 Gbytes. For both modes
you have to know the physical hard-disk structure in terms of Cylinders, Heads and Sectors.
So, for an easy use of any kind of disk, the Auto option is preferable.
• Note: to speed-up the bootstrap select the option None for unused ATAPI devices.
PIO Mode
PIO is a special data-transfer system between two or more EIDE devices, where all the data pass
through the processor. There are five transfer rates, called PIO mode n (with n=0..4). If the Auto
(autodetect) option is disabled, the PIO mode must be specified.
Option Description Note
PIO-0 Transfer Rate of 3.3 MBps
PIO-1 Transfer Rate of 5.2 MBps
PIO-2 Transfer Rate of 8.3 MBps
PIO-3 Transfer Rate of 11.1 MBps
PIO-4 (*) Transfer Rate of 16.6 MBps Default setting for both
ATAPI Units (Master1 &
Slave1)
(*) = Default setting