Satisfied with the order and delivery on Amazon.com. The Internal HDD 2.5 "- SATA-300 - 500 GB Western Digital (WD5000BEVT Scorpio Blue) was installed without problem on the sony-VGB FE31M It works wonders and the data transfer rate to the disk. is now 5.7 (Vista performance index) .Western Digital - Scorpio Blue WD5000BEVT - Internal HDD 2.5 "- SATA-300 - 500 GB