For even faster access and better reliability take those 4 new 5TB HDs and put them in an external enclosure, and use SoftRAID to create a RAID 5 array. Then eve if one of the drives fails you simply replace the failed HD and SoftRAID will automatically rebuild everything that was stored on the failed drive with no interruption in service.
If we knew what it was we were doing, it wouldn't be called research, would it?
