I have database with mdf and ldf file residing on external drive. There was a long powercut and the database restarted. Now the database has gone for recovery pending. The database is around 600 gb.

I have tried the following commands



but i am getting the following error

Msg 5120, Level 16, State 101, Line 4 Unable to open the physical file "G:\SQL_DATA\TEST_NEW.mdf". Operating system error 5: "5(Access is denied.)". File activation failure. The physical file name "G:\SQL_DATA\TEST_NEW_log.ldf" may be incorrect. Msg 5181, Level 16, State 5, Line 4 Could not restart database "TEST_NEW". Reverting to the previous status. Msg 5069, Level 16, State 1, Line 4 ALTER DATABASE statement failed.

I have tried all options.

Do any body has a working solution. Please share it will save my day.

  • Hi, do the files "G:\SQL_DATA\TEST_NEW.mdf" & "G:\SQL_DATA\TEST_NEW_log.ldf" exist? Does the sql server service account have sufficient rights on this folder? Commented Apr 19, 2019 at 8:45
  • Yes both the .mdf and .ldf exists on the path. There is no rights issue.
    – Karan.T.
    Commented Apr 19, 2019 at 9:08
  • I tried the DBCC TRACESTATUS it give me the following message. " DBCC execution completed. If DBCC printed error messages, contact your system administrator."
    – Karan.T.
    Commented Apr 19, 2019 at 9:28
  • The G:\ Is an external drive right? What kind of drive is it? Commented Apr 19, 2019 at 9:42
  • Its a hard drive size around 1 TB.
    – Karan.T.
    Commented Apr 19, 2019 at 9:43

2 Answers 2


As previously mentioned, make sure the SQL service account has permissions on the files. Here is a quick snippet to help you do that:

-- From SQL:
-- get full path for master
SELECT SUBSTRING(physical_name, 1,
LOWER(physical_name)) - 1) DataFileLocation
FROM master.sys.master_files
WHERE database_id = 1 AND FILE_ID = 1

-- get the service accounts
SELECT servicename, service_account FROM sys.dm_server_services
# From Powershell (run as admin) and replace with values you got from the previous step 

# replace with master db path
$masterDBLocation = 'C:\Program Files\Microsoft SQL Server\MSSQL11.SQL1\MSSQL\DATA\'

# replace with SQL service account
$serviceAccount = 'DOMAIN\svc_DatabaseEngine'

$mdf = 'G:\SQL_DATA\TEST_NEW.mdf'
$ldf = 'G:\SQL_DATA\TEST_NEW_log.ldf'

$Acl = Get-Acl $masterDBLocation
$Ar = New-Object System.Security.AccessControl.FileSystemAccessRule($serviceAccount, "FullControl", "Allow")

Set-Acl -Path $mdf -AclObject $Acl
Set-Acl -Path $ldf -AclObject $Acl

thanks for all your support, I figured out the issue. Our Admin skipped one user. domain\Users was missing from the folders permission. I know it is a silly mistake. But because of this I got to learn more.

I added permission to the folder by adding the domain\Users, and the error disappeared.

Thanks again.

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