IDE Drives Are Not Detected After Flashing to BIOS on 1803 Asus P5b
The ASUS P5B uses the basic input/output system to control the hardware connected to the board. The motherboard manufacturer releases regular upgrades to the BIOS to improve hardware support and fix old bugs. While these updates to the software are designed to reduce system errors, some versions can cause new issues, while repairing old ones.
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IDE Socket
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The ASUS P5B comes with one integrated drive electronics socket, instead focusing on serial advanced technology attachment as its primary storage interface. Unlike SATA connectors, however, which can accommodate up to one device at a time, IDE connectors can hold a maximum of two devices. Because these devices communicate with the computer through the same bus, the BIOS will fail to detect both drives if it cannot see the IDE bus.
1803
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BIOS version 1803, released on October 30, 2007, fixed problems with the central processing unit settings and added support for an option to alter the CPU multiplier. Version 1803 shouldn't affect the behavior of the IDE devices, but if an error occurred during the BIOS upgrade, one or more devices could be affected. Updating the ASUS P5B to the latest BIOS release available on the ASUS website is recommended.
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SATA Mode
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Some SATA devices can function as IDE devices depending on the settings in the BIOS. In the IDE Configuration sub-menu is the option "Configure SATA As", which changes the device to IDE or advanced host controller interface mode. If the SATA device is set as AHCI rather than IDE, older operating systems like Windows XP might fail to see the drive, since these OSes don't support AHCI.
CMOS Settings
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If you experience problems with one or more devices after flashing the ASUS P5B to BIOS version 1803, you should reset the complementary metal-oxide semiconductor settings. The CMOS contains the data that the BIOS uses to initialize the hardware in the computer. If the CMOS is using the configuration information tied to the old BIOS version, the motherboard may have difficulty operating. Next to the floppy disk drive connector is the CLRTC jumper; placing the jumper cover on pins 2 and 3 for five to 10 seconds clears the CMOS data.
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