Server Hard Drive will be faster, perhaps even SCSI, and more expensive, especially if it is. Or it will be cheaper, and huge, because it wants to be an Archive.
Well then a Server one is going to be the best bet. Make sure its expensive, got good RPMs and good Cache. SCSI may be the best option, if you have the PCI Adapter for it.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.