We have a Windows 2003 R2 server with SP 2 here that randomly loses a partition.

There are two partitions the C: and the D: (the one that disappears).

When I go into Disk Management the space shows available on the drive but that it isn't formated.

There are two drives that are set up in a RAID 1 array.

There isn't anything sticking out in the event log as to something triggering this problem and thank god we do daily backups of the data, but it gets kind of annoying to have to go back in there and reformat the partition and restore the data.

Any places I can poke around to find the cause of this or even better solutions to the problem would be appreciated.