I did some tests comparing the Seagate Barracuda 500GB. Read the Seagate 112.1 Mb / s while the Western Digital 95.5. As for the noise so that the WD is very quiet, but when transferring data, or running an operating system seems too exaggerated. Windows 7 also runs more smoothly on Seagate.
What I want to know is whether the test results that I run on my drives are good or there are problems.