Tinnitus is the name for these head noises, and they are very common. Nearly 36 million other Americans suffer from this discomfort. Tinnitus may come and go, or you may be aware of a continuous sound. It can vary in pitch from a low roar to a high squeal or whine and you may hear it in one or both ears.
By default, the directory where all database files and transaction log files are located is \Program Files\Microsoft SQL Server\Mssql.1\Mssql\Data. When you run SQL Server Setup, you can specify a different location as the default location for data files. The data file location is the root directory where Setup creates the folders that contain database and log files, in addition to directories for the System log, back-up, and replication data.
SQL Server transaction logs. A transaction log is a sequential record of all changes made to the database while the actual data is contained in a separate file. The transaction log contains enough information to undo all changes made to the data file as part of any individual transaction.