WD15EADS-00P8B0 Really slow

Purchased a Western Digital 1.5TB Caviar Green an on the 30th of November from Amazon, sent to my doorstep, mounted, installed...... then started the course of action of doing full segment and organizes on the entire drive.Running Vista x64, which has for the most part worked well enough on my framework (Intel Core 2 Duo E8400, 8GB DDR2 RAM). The entire parcel course of action took regarding a week, running away from anyone's notice as I utilized my machine, utilizing the "Disk Management" apparatus, under "Storage" in the "Computer Management" system. Four essential parcels were made, doing a full organize (as restricted to a speedy organize), the first three at 300 GB, and the rest of the space dispensed to the fourth partiotn. The fourth segment was arranged utilizing diskpart in summon immediate, as the Disk Management instrument didn't would like to make the fourth segment an essential segment.