You got lucky but hard drives are getting cheaper and cheaper and the memory is not to bad either. My Mac Pro 5.1 has 16 GB of memory and all 4 hard drive slots are in use. Windows 7 is drive bay 4 with 250 GB of hard drive and the then I have 3 other drives in for 3 TB with OS X on them and then a 3 TB external drive for Time Machine.