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EPC-9 Hardware Reference
3
3
3-8
used. Note that autotyping may change this value if the hard disk reports that it
supports LBA. The default is “Disabled ”.
32-bit I/O
This option allows the System BIOS to access the hard disk controller with 32-bit I/O
accesses, increasing system performance. This selection is not affected by autotyping.
If the onboard PCI IDE controller is being used, then this option should be set to
“ Enabled” to maximize system performance. If an EXM-MX or EXP-MX is
installed in the system, then this option should be set to “ Disabled” . The default is
“Disabled ”.
Transfer Mode
This option selects the mode that the System BIOS uses to access the hard disk. The
selections are:
Standard (default)
Fast PIO 1
Fast PIO 2
Fast PIO 3
Fast PIO 4
Fast DMA A
Fast DMA B
Fast DMA F
Older hard disks only support “ Standard” . Newer hard disks adhering to “ Fast
ATA” or “ Enhanced IDE” specifications may support the fast programmed I/O or
DMA modes. Note that autotyping may change this value depending on the transfer
modes that the hard disk reports it supports. The fast DMA modes take full advantage
of the onboard bus mastering hard disk controller and should yield the highest
performance when used in conjunction with multitasking operating systems that
support it. The default is “Standard ”.
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