Database Attach error encountered

Would appreciate any inputs.

I am running SQL2005. I am trying to attach to a database located on an external hard drive that is connected to my laptop via USB connection. The database files are a copy of the database files from a server running SQL2005.

After making the copy of the database, we confirmed that we could attach to the database on the external drive from the server and were successful attaching, opening and accessing the copy. Brought the HD home to work with the database and am getting the following error when I try to attach:

Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476

Program Location:

at Microsoft.SqlServer.Management.Smo.Enumerator.Process(Object connectionInfo, Request request)
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabaseData.PrimaryFile.GetOriginalDatabaseName(String primaryFilePath)
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabaseData.PrimaryFile.PopulatePrimaryFileData(String primaryFilePath)
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabaseData.PrimaryFile..ctor(SqlManagementUserControl parent, CDataContainer dc, String fullPath, String databaseOwner, ServerConnection connectionInfo)
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabase.IsSelectedFileValid(BrowseFolder dlg)

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An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

Program Location:

at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteReader(String sqlCommand)
at Microsoft.SqlServer.Management.Smo.ExecuteSql.GetDataReader(String query)
at Microsoft.SqlServer.Management.Smo.DataProvider.SetConnectionAndQuery(ExecuteSql execSql, String query)
at Microsoft.SqlServer.Management.Smo.ExecuteSql.GetDataProvider(StringCollection query, Object con, StatementBuilder sb, RetriveMode rm)
at Microsoft.SqlServer.Management.Smo.SqlObjectBase.FillData(ResultType resultType, StringCollection sql, Object connectionInfo, StatementBuilder sb)
at Microsoft.SqlServer.Management.Smo.SqlObjectBase.FillDataWithUseFailure(SqlEnumResult sqlresult, ResultType resultType)
at Microsoft.SqlServer.Management.Smo.SqlObjectBase.BuildResult(EnumResult result)
at Microsoft.SqlServer.Management.Smo.PrimaryFile.GetData(EnumResult erParent)
at Microsoft.SqlServer.Management.Smo.Environment.GetData()
at Microsoft.SqlServer.Management.Smo.Environment.GetData(Request req, Object ci)
at Microsoft.SqlServer.Management.Smo.Enumerator.GetData(Object connectionInfo, Request request)
at Microsoft.SqlServer.Management.Smo.Enumerator.Process(Object connectionInfo, Request request)

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CREATE FILE encountered operating system error 5(Access is denied.) while attempting to open or create the physical file 'E:\Navision SqlData\ForentaSQL_Data.mdf'. (.Net SqlClient Data Provider)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=09.00.3159&EvtSrc=MSSQLServer&EvtID=5123&LinkId=20476

Server Name: twdlaptop1
Error Number: 5123
Severity: 16
State: 20
Line Number: 1

Program Location:

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
at System.Data.SqlClient.SqlDataReader.get_MetaData()
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader()
at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteReader(String sqlCommand)

It looks as though your problem is a permissions problem. When you're at home you're using a different login context than you are when you're at work. The external HD allows the work login access, but not the home login. I'd look at the security tab under the properties menu item for the directory where the database files are stored and see if you can add your home login to the list of allowed users.