Sony Dvd Test Disc ((better)) -

To get the most out of the Sony DVD Test Disc, users can perform a series of tests:

: Many Sony players (e.g., DVP-NS series) feature a "Drive Auto Adjustment" mode in the service menu that requires both single-layer and dual-layer test discs to recalibrate the drive automatically. Accessing the Test/Service Mode sony dvd test disc

Do not attempt to use a Sony DVD test disc unless you have: To get the most out of the Sony