sinspider :
Yesterday i was using all my drives fine when i shut down. today i started my rig up to find my main storage drive is not appearing. when in administrative tools it asks me to initialise the drive. Except this drive was 80% full as a 1TB western digital drive. could this be a virus/bad sector/anything else issue?
If you have a fairly recent motherboard running a Core 7 or Core 5 CPU in conjunction with an Intel Series 6 Express Chipset, then it is a possibility that the chipset has a design fault.
I had a similar problem after recently upgrading my PC when my hard drives started to disappear one by one over the course of a few days. After an exhaustive search for a solution I finally came upon an Intel page describing the fault, how to diagnose it and how to proceed.
Please see
http://www.intel.com/consumer/products/processors/chipset.htm
On my motherboard, SATA port 1 continued to work, which had the OS installed on it, but ports 2-5 died one by one over the course of a few days. They would work again for short periods at a time after unplugging, waiting for the hard drives to cool a bit and then hot plugging them in again.
I emailed the place I purchased the board from, which is in Australia, attaching a Device Manager snapshot to confirm my chipset and a replacement motherboard was organised very quickly, no worries. I was surprised and appreciate the quick response and good service I received.
Hope this helps