Whilst the physical size of the drives is indeed one difference it is not the only difference by a long way.the only difference in the hard drives is 2.5 3.5!
Mechanical hard drive speeds are stated in rpm ie. in this case 7200rpm, whilst SSD speeds are stated as MB/sR and MB/sW (thats Mega Bytes Per Second for Reading and Mega Bytes Per Second for Writing) so you can't really see the comparison in numbers, but SSDs are significantly faster than mechanical hard drives (if you google comparisons between the two drives in the spec above you can see the difference), but SSDs are also a lot more expensive.
The reason for two hard drives in this case is so you can have a really fast drive (the SSD) for booting and main programs, and a slower drive for everything else since you don't really need a fast drive for storing most data and it saves money since large SSDs are still really quite expensive. So having two drives is basically a compromise, you get speed and you get storage space, but they are separate.
This is generally done to boost the graphics power of the machine (often done as an upgrade option later on when the machine is starting to struggle with newer games) - but said machine does have to have a big enough power supply and a motherboard that can do SLI (for NVidia cards) or Crossfire (for AMD cards).why would add a 2nd gpu if were to ?
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