win7+sql2008 Unable to open physical file operating system error 5: Access denied to SQL Sever

Today in the WIN7+SQL2008 environment to operate separate additional databases, separated and then attached, no problem. But a. mdf file is copied to the other folder and an error is as follows:
The physical file "E:\db\MyDB.mdf" could not be opened. Operating system error 5: "5 (Access denied. )"。 (Microsoft SQL Server, error: 5120)
Asked a friend, friend said to find the. mdf file to change the security permissions of the file.
It took a while to understand that the original is to find. mdf file, right--Properties---security, select Current user, edit-and-Full control.
If this is the case, remember that the security permissions for the. log file are also

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win7+sql2008 Unable to open physical file operating system error 5: Access denied to SQL Sever