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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.

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Anti-virus is up to date? Hardware or Software RAID? SMART compatible HDs, if so what's the report? –  Chris S Apr 27 '10 at 19:01
    
Hardware RAID. It's from Dell and they have a tool on there to diagnose the health of just about every component, and everything comes back healthy. The Dell guys even went over it and couldn't find anything wrong to cause the issue, the only way we could have gotten them to dig in more was to pay for the extended contract that covered software since they say it doesn't look like a hardware issue. –  Mike Keller Apr 27 '10 at 19:46

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