Some VSS providers (I met such situation during the HP P4000 application aware snapshot creation) after snapshot creation leave read-only attributes bit set in created snapshots. In this situation the Snapshot or SmartVolume can be mounted to Windows server only as read-only volume.
To clear this attributes the Microsoft DiskPart utility can be used (volume V: as example)
DISKPART> select volume V:
Volume 2 is selected volume.
DISKPART> attributes volume clear readonly
Volumes attributes cleared successfully.
