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SQL .mdf, .ldf path from query

try this code

DECLARE @retvalue int, @data_dir varchar(500)
EXECUTE @retvalue = master.dbo.xp_instance_regread 'HKEY_LOCAL_MACHINE',
'SOFTWARE\Microsoft\MSSQLServer\Setup',
'SQLDataRoot', @param = @data_dir OUTPUT
PRINT 'SQL Server Data Path: '+ @data_dir
i get it from here
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