Very noisy Plextor DVD Drive

Hi, I have a Plextor DVDR drive (forgot the model, but its the one that comes with a usb tray, and I opened it and placed in the IDE) that is very noisy.

I know that a high speed dvd drive is suposed to be a bit noisy, but when it spins the disc in max speed, its even louder than my cpu cooler, and its not a normal dvd noise, its something like if my drive was full of sand o.0

The driver reads and burns normally and it didnt damage any dvds yet, but this noise is bothering me a bit since its very loud.

So, since my driver is out the warranty, any ideas in how I can fix it? Where I should start looking after opening it?