vmN :
I meant, it should not be worse to record to the same drive as your OS is installed on.
Also, please come with a technical reason why it would be bad, as then you would need an entire drive for the only purpose is to record to it.
Why would you experience 1sec laggspike for recording to the HDD with the OS, that doesn't make sense.
The program (in this case Fraps) will be running on your HDD, and at the
same time read from and write to the HDD. This can cause minor errors (laggspikes) and slow down system performance.
Edit: 1 sec laggspikes where more of an example... They can be longer /(shorter). I was just trying to make the point clear.