Swapping hard drives in an Xserve drive module


I am aware of the fact that the G4 Xserve models use different drives from the G5 and Intel Xserves, whose drive modules are interchangeable.

If I buy a used Xserve with small-capacity drive modules, what type of drive mechanism should I buy, in order to make an upgrade-swap? Likewise, what type of drive would I be looking for to upgrade the capacity of a G5/Intel Xserve drive module?

Dominik Hoffmann