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Configuring Parallel ATA and Serial
ATA devices
ATA Operate Mode
There are two modes to choose from: Legacy mode and Native mode.
1 Legacy Mode
• System BIOS assigns 14 and 15 IRQs for HDD use
• Older OSs that do not support Native Mode (DOS, Win2K,
Win98/ME...) should set S-ATA and P-ATA to Legacy Mode
• Maximum 4 ATA devices to connect under Combined mode or
Non-Combined mode
a Non-Combined Mode: S-ATA devices only - Maximum of 2 devices
b Non-Combined Mode: P-ATA devices only - Maximum of 4 devices
c Combined Mode: S-ATA devices and P-ATA devices - 2 devices each
(Maximum of 4 devices)
2 Native Mode
• System BIOS will search all available IRQs for HDD use
• New OSs that support Native Mode (Windows® XP
Professional, Windows® 2000) can set S-ATA and P-ATA to
Native Mode
• Comprehend both Legacy and/or Native Modes
• Maximum of 6 devices can be connected (4 P-ATA and 2 S-ATA)
Note: Proper support; BIOS provides a BIOS setup option for user
selection of Native Mode or Legacy Mode.
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