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What is the meaning of VIA ATA Channel in the "Device Manager" of my computer? Why is there a yellow exclamation point in front of it?
VIA is the name of the company that makes the chipsets on motherboards.
ATA is a hard disk interface.
Channel refers to the hard disk transfer data channel.
The yellow exclamation point means that the "driver" for your device is not installed, the solution: install the motherboard driver.