Moving the WSUS Database on SBS 2008/2011:
Open Windows SBS Console, Backup and Server Storage, Server Storage.
Click on Move Windows Update Repository Data.
Follow instruction and choose targer disk.
The process DO NOT move actual DB (SUSDB.mdf).
Open Microsoft SQL Server Management Studio Express as administrator to move the DB.
Connect to server: \\.\pipe\MSSQL$MICROSOFT##SSEE\sql\query
Expand Databases and right click on SUSDB to choose Tasks - Detach.
Tick drop connection and ckick ok.
After DB detachet, move directory SUSDB to another location.
Back to Microsoft SQL Server Management Studio Express and right click on Databases - Attach.
Choose SBSDB.mdf from new location and ckick OK.