TEAC's new 1x3 and 1x7 CD-R Duplicators are stand-alone disc-to-disc CD-R Duplication systems requiring no PC Connection. With the numerous menu commands, optional hard disk drive, TEAC's Tower Series CD-R duplicators offer the best solution for production level CD-R Duplication requirements today. If fitted with the optional hard disk drive, data can be stored allowing quick retrieval and duplication of your CDs. The systems also Verify, and will Copy / Compare discs that are duplicated.