PT AMC123, User Manual

Page: 49 / 104

BIOS Configuration Overview
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7. Under the corresponding port change the speed from AUTO to 1.5 Gbps .
8. Press <Esc> to exit this screen.
9. Right arrow to select the Exit menu item. Save Changes and Exit is highlighted.
10.Press <Enter> . OK is highlighted.
11. Press <Enter> to exit the BIOS setup utility.
12.Boot the AMC123.
The BIOS will now be able to detect the drive. In AHCI mode the PCI Device ID will change
from 5028 to 5029. See
Table 3-2, “PCI Device Summary,” on page 53 .
Note: The operating system will also have to support the AHCI mode of operation.
The AMC123 will have no trouble detecting a hard drive on an AM590, if the hard drive installed
on the AMC590 supports SATA II and a 3.0 Gbps interface. The AMC123 can run in either
Enhanced IDE Mode or AHCI Mode , as determined by the BIOS Setup configuration.
Notes:
•
SATA II, 3.0 Gbps data transfer rate in
Enhanced IDE Mode - In this mode the AMC123 can only
detect a SATA II, 3.0 Gbps hard drive. This is because it does not know how to negotiate down to 1.5
Gbps.
•
SATA II, 3.0 Gbps data transfer rate in
AHCI Mode - When set for 3.0 Gbps the AMC123 can only
detect a SATA II, 3.0 Gbps hard drive. This is because it does not know how to negotiate down to 1.5
Gbps.
• PT has added a speed-limiting option to the BIOS to set the maximum speed to 1.5 Gbps for SATA I
hard drives. This setting can be found under the BIOS Setup screen for AHCI and can be controlled
for each port.
• For operating systems that do NOT support AHCI (such as CentOS 4.5) or have other issues
detecting the drive, do the following:
• Set the BIOS to IDE and Compatible . The BIOS and OS should detect the drive.
• For other vendor's storage AMCs, a hardware switch may be available to slow down the interface in a
similar manner to the way the BIOS setting does for the AMC123.