FSX on second HD or partition?

[Kermit_70 7]

Hello,

I am quite new at these hardware tweaks, so please excuse the obvious question... I am getting a new machine and will re-install everything I have related to FSX (see below). 

 

I read over and over in this Forum that FSX is better installed on a "separate HD" from OS, but I am not exactly sure about this:

1) should it be a physically separated, second HD in the machine (internal second HD, as sometimes I see in PCs for sale)?

2) could it be just a partition of a single HD?

3) What exactly would you put in the second HD/partition, beside FSX, assuming that in the first HD/partition I will have OS? I have adds-on such as ORBX scenery, Carenado aircrafts, Reality XP gauges, EZDok camera, and I am planning to get REX4 for weather and VoxATC for ATC and traffic: where should all this go?

 

Many thanks for the help!!

[Kermit_70 7]

I ended up doing it on separate SSD.

All good so far.