System seems slower after new hard disk installation.

Dear all:
After a recent hard disk crash that caused me to lose a lot of important professional and personal information I replaced my old defective hard disk (a Seagate Barracuda 1.0 TB internal SATA drive) with a new one (a Seagate Barracuda 1.5 TB internal SATA drive).
The issue I am now experiencing may or may not be related to the new drive but I wanted to post it here and have your opinions about it. It seems to me that since this new hard disk was installed that my system is slower than it was before. Something else I noticed is that iTunes seems to hang every once in a little while, freezing and a while later resuming its operation (as if it were frozen while trying to read the information from its library located on the new hard disk ???).
Since the capacity of the new disk has increased some 50% compared to the older one, could this be the issue ? Can the fact that the 1.5 TB hard disk are new technology be a reason why this is happening (some issues still not completely resolved) or could it be that the capacity being so much greater requires the drive to work harder at finding the data ?
In case the information is relevant the drive's speed is 7200 rpm but I couldn't find any information (including Seagate's own web site) about its seek time spec.
Something else I noticed is that since I've installed the two 1.5 TB internal drives the fans inside my G5 have become more noticeable, raising their speed to a noisy level every now and then depending on what I am doing with my computer. This didn't happened before when I had only one internal hard disk installed (my original purchase configuration) and when I had (2) internal 400 GB hard disks installed.
Any ideas ?
Thank you in advance.
Joseph Chamberlain

Turns out I used screws that were too long above the optical drive which blocked it...

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