Are these drives physical or virtual? Do you physically have more than one hard drive in your computer, or did you have one hard drive that was partitioned into seperate drives?
What file formats are each of the drives? Fat, Fat32 or NTFS?
Perhaps you need to go to Disk Management to 'reconnect' these drives, but be warned you can lose the data on them if you don't properly read the messages that popup. I don't have a computer with disconnected drives so I cannot properly point you in the right path, but I recently saw a computer like this. (unfortunately I didn't read the message, clicked yes and wiped out the data on the drive)
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