Moving Database Files
SQL Server 2008
In SQL Server, you can move system and user databases by specifying the new file location in the FILENAME clause of the ALTER DATABASE statement. Data, log, and full-text catalog files can be moved in this way. This may be useful in the following situations:
Failure recovery. For example, the database is in suspect mode or has shut down, because of a hardware failure.
Planned relocation.
Relocation for scheduled disk maintenance.