Speed hard disk

I’m about to buy a computer to record music and I’d like to use Audactity. I already read about the requirements - Ghz and Gb - of the processor in relation to what you want to do and wich version of Windows you use. Some people say that the speed of the hard disk is also very important. I get different answers. Some say 5400 rpm will do, others say you have to have at least 7200 rpm. Can anybody bring some clarity in this ? Thank you very much.

Given the choice, faster is better, particularly for multi-track recording.