[n: Programmed Access In Sequence To Addressed Parts Of Tracks Of Operating Record Carriers (access By Moving The Head G9b/3.011, G9b/5.181, G9b/7.042, G9b/21.004; By Moving The Record Carrier G9b/15.001, G9b/17.001, By Driving Of Both Record Carrier And Head G9b/15.023] {g11b 27/10a} Patents (Class G9B/27.018)