CPU Bottleneck when recording?

I am not sure if it is my CPU or Hard drive but when I record with fraps at 50FPS my FPS on minecraft drop to 40, it can go lower than 40 but it won't go higher than 40. Is this my processor giving the bottleneck or is it my hard drive, I am recording and playing on the same hard drive. If I were to buy another hard drive would one with 16MB cache be enough for recording of should I go with one that has more

Intel Pentium G850
AMD 7770 (13.1 drivers)
500GB WD SATA 3 7200rpm
8gb ddr3 gskill ram (irrelevant but posting)
500w PSU (irrelevant but posting)

Thanks for your help everyone!
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More about bottleneck recording
  1. Also, I forgot to mention the processor has intel stock fan
  2. A dual core cpu + multitasking is going to suffer.
  3. Leave task manager running while you play the game.
    Immediately after exiting the game check task manager to see what the CPU load was like when playing the game.

    If the CPU load < 50% then it is more likely your hard drive slowing things down.
  4. Ahh okay thanks guys! So if its more than 50% it's the hard drive? Also, how should I test it, while recording or just running the game?
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