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

On a modern ATX motherboard, typically, two PATA (Parallel ATA) devices can be installed. This is due to the design of the PATA interface, which allows for a maximum of two devices per connection. Each PATA connection, or port, can accommodate two devices organized as primary and secondary, utilizing a master/slave configuration.

Since most modern motherboards include only one or two PATA connectors, the maximum number of devices supported on these connectors would be limited to two, making it a standard configuration in contemporary builds.

In contrast, other options indicate a higher number of devices, which does not align with the typical PATA interface limits on modern boards, especially as many newer motherboards have largely transitioned to SATA (Serial ATA) drives, which allows for different configurations and higher numbers of devices connected.