Sector Tester is a new & used music CD "sector" tester that checks music tracks for scratches and data integrity in seconds. If you burn your own music CD's - you need to be absolutely sure they're readable before deleting any files from your hard drive. Sector Tester can read every track (sector) in seconds, giving you peace-of-mind that your CD-ROM collection is problem free. Sector Tester also works on MP3 files.