LiteOn's latest DVD writer, the iHAS 324, can not only burn files to disc but also erase those discs once you're finished with them. This SmartErase features relies on the drive's special laser that can alter the surface of a CD-R or a single or two-layer DVD, erasing the contents so they're unrecoverable. It can erase any write-once CD or DVD burnt by any DVD writer, but not commercially produced discs or rewritable CDs or DVDs, which can already be erased using any DVD writer.