Ken posted in the faq for WHS v1 a batch file for running chkdsk on all of your drives. I imagine the same thing is possible in Vail, but I don't know how to access each individual data drive. I am having issues with one of the 2tb drives in my Vail box.
I have built a server on a D510NM Intel atom board. I have a pci to sata2 card with the data drives connected to it. The system drive and a DVD drive are connected to the main board.
One of the data drives keeps showing up as critical in the dashboard. I have removed it from the storage pool and later added it in again with the same result.