The magneto-optical disk recording device disclosed is for recording and reproduction using a one-beam optical head and includes a magneto-optical head, a reproduction amplifier, a recording data delay circuit, a recording state detection circuit, a data comparator circuit, and a record judging circuit....http://www.google.com.au/patents/US5889744?utm_source=gb-gplus-sharePatent US5889744 - Magneto-optical disk recording device and capable of verifying recorded state during recording and checking erased state during erasing
