The initial storage policy for the Windows operating system is OfflineShared, so data LUNs (disks) for a newly commissioned partition need to be explicitly brought online.
To bring a disk online, do the following:
Access the Windows Disk Management console (MMC snap-in).
Locate the disk in the graphical view pane at the bottom of the display window.
In the left-hand area for the disk, right-click the label, and then select Online.
The disk is brought online.
If the disk was used previously, it is in the same state as when it was last used; if the disk was not used previously, it is uninitialized.
If necessary, initialize the disk: In the left-hand area for the disk in the graphical view pane, right-click the label of the disk, select Initialize Disk, select your desired disks in the disk initialization dialog box, choose the partition style, and then click OK.
If necessary, use the graphical view pane to create disk volumes: In the right-hand area for the disk in the graphical view pane, right-click the disk, select the type of volume, and then step through the wizard.