Connecting Several HDD to form "one" drive

  m800afc 13:47 20 Apr 2008

How feasible is it to connect external HD drives together to form one contiguous drive? For example, is it possible to connect two 500GB to give a 1TB drive? Is is possible to add extra capacity to this setup at a later stage, eg: adding more 500GB drives, but still keep the set up as contiguous?
Or am I best just getting vanilla external drives and keeping them separate?

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