A data recording/reproducing apparatus uses a single recording medium in which absolute address data are previously formed. Also, the data recording/reproducing apparatus has a first memory for recording and a second memory for reproducing. Audio data reproduced from the recording medium is stored in...http://www.google.co.uk/patents/US5343452?utm_source=gb-gplus-sharePatent US5343452 - Data recording/reproducing apparatus of simultaneously performing both reproducing and recording from and in a single recording medium
