Cluster disk shows as raw file system

Hi,

We recently performed the below action after which one of disk in windows 2008 R2 cluster shows as RAW file system. Is there anyway to change it back to NTFS?

1) There was one cluster disk which was a mounted volume.

2) We made this disk resource offline and online without un-mounting it first.

3) Now, the disk status shows as RAW file system.

Please help.

Thanks,

Umesh.S.K