| 摘要 |
1432693 Data recording system INFORMATION STORAGE SYSTEMS Inc 26 April 1973 [24 July 1972] 19931/73 Heading G4C A data recording system includes a recording device arranged to record data on a storage medium (e.g. a magnetic disc) under control of a controller, the device including means for recording data at selected locations in response to signals from the controller, each location having a distinct length, and means for erasing any remaining part of a selected location following completion of recording in that location, the erasing means being operative independently of the controller and supply an "erasing" signal to the controller during the erasing. As described a controller operates three disc stores A, B, and C. The controller supplies data over line 26 and a write signal over line 25, the data being recorded in a selected location on disc 12 by a head 15 via AND 27, OR 28, and driver circuits 29. The locations are defined by signals read from a servo disc 14 which rotates in synchronism with the data disc 12. When the recording is complete the controller supplies a signal over line 41 to set a latch 40 which provides a busy signal to the controller and enables gate 39 to pass filler bits (ones or zeros) to the write driver, the filler bits being derived from an oscillator 35 phase locked to a clock track read by head 16. A circuit 44 associated with the servo disc generates an index pulse at the end of the selected location to reset latch 40 and make the device available to the controller. The arrangement allows the controller to service other jobs, e.g. on the other disc stores, during the erasing period. |
