said by Mont:Thanks , i thought about the fan but i notice that as soon as the drive write it does that sound.
I'm sorry to say I can't really hear the difference in the video you provided. All I can hear are the two noises I mentioned -- the constant noise of what sounds like a very loud fan, and something growling/grinding that also sounds like a misaligned or faulty fan motor.
Do you have a stationary microphone or something you can place near/around the PC case (while it's open), particularly near the hard disk, then provide audio of the system idling (no disk I/O), then doing a large amount of disk I/O (specifically reading, then followed up with writing)?
I myself have incredibly sensitive hearing so I pick up on noises (especially high and low frequencies) that a lot of other people can't hear -- but recordings with a digital camera or mobile phone often do not work well given the quality.