Question : SBS 2008 falsely reporting no available disk space

I have SBS 2008 installed on a server with a single partition which I think may be the causing the problem I am having but hopefully not.

I have 300GB of free space but when I try to copy a substantial amount of data to a folder on C: it is not allowing me because it thinks the drive is full. Has anyone seen this? any help would be appreciated.

Answer : SBS 2008 falsely reporting no available disk space

No, Windows quotas apply DISK WIDE (as in logical drive letter).  While Windows DOES have the ability to apply quotas to Folders, I believe the default is the disk wide.  Change that value to 20 GB and see what happens.