How many PATA devices can typically be installed on a modern ATX motherboard?

The correct answer reflects the standard design of modern ATX motherboards which typically support two PATA (Parallel ATA) devices. This is achieved through the inclusion of two PATA interfaces, allowing each interface to connect one primary and one secondary device such as a hard drive or optical drive.

PATA uses a 40-pin connector, and each PATA interface supports a master/slave configuration, meaning that each channel can interface with two devices; however, the number of devices that can be connected simultaneously is limited to two at a time due to the constraints of the motherboard design. This capacity echoes the historical design of the bus architecture, which has evolved towards more efficient interfaces like SATA (Serial ATA), further relegating PATA to legacy status within contemporary hardware setups.

In contrast, other options suggesting higher numbers do not align with the limitations of standard ATX motherboard designs and the legacy nature of PATA technology.