Got a replacement 2.5" Laptop 320GB HDD (Toshiba 7200 rpm) from HP. I already replaced my laptop with a SSD. I wanted to build a low power home server/File Server. Should I use this drive or a cheap OCZ 64 or 90GB SSD for OS? Data will be stored in a 1.5TB WD green drive. Board will be a Gigabyte E-350 USB3 and 8 GB ram. PSU is Antec 80+ Bronze certified 350w continuous power. Or should I just go with regular desktop drive (have a spare 500GB single platter 5400 rpm Samsung green drive)? Lowest power consumption and most efficient is my goal.