When you are developing a SQL Server database you might want to use External Storage devices. Beware of a couple of slight gotchas. When you restart your machine SQL Server may start before the drives become available. If this happens SQL Server will mark the database as ‘pending recovery’. To get out of this situation just restart the SQL Server instance and select ‘refresh’ the database node in SQL Management Studio. A second, related problem, is that the drives may not be assigned the same drive letter, this will again result in ‘pending recovery’. If you cannot remember the drive letter you assigned you can run the following against the system database;
select [name], physical_name from sys.master_files
If you now have an incorrectly assigned drive letter, the best solution is to open the disk management tool where you can right-click and assign the original drive letter back.