Patent ID: 6772284
Filing Date: 2004-08-03
Classification: G11B,H04N

Abstract:
A disk apparatus using a recording disk and connected to an input/output device, comprising;a recording and reproducing head which records and reproduces digital data on and from the recording disk, the digital data being recorded on a plurality of recording areas of the recording disk at different positions with respect to a radial direction of the recording disk; a dual port buffer memory that includes at least a first input to receive the digital data at a first bit rate, a second input to receive the digital data at a second bit rate, and a first output to provide digital data stored therein at a third hit rate, and a second output to provide digital data stored therein at a forth rate, said buffer memory configured to temporarily store the digital data reproduced by the recording and reproducing head to compensate for differences at least between the first and third bit rates, wherein the buffer memory has a memory capacity based on a bit rate of the digital data, a maximum access time required for moving the recording and reproducing head from an innermost periphery of the recording disk to an outermost periphery plus a time required for rotating the recording disk by one rotation, and at least one seeking retrial; and a controller coupled to said recording and reproducing head and said buffer memory, wherein said controller operates to control said recording and reproducing head and said buffer memory to: selectively reproduce digital data for a time more than an access time to access said plurality of recording areas of the recording disk at the second bit rate and store the digital data in said buffer memory, selectively record digital data from said buffer memory to said plurality of recording areas at the third bit rate, continuously reproduce digital data recorded in a plurality of areas in different position with respect to the radial direction, including reproducing uninterrupted digital data anticipated to be edited before the digital data reproduced by the recording and reproducing head is edited, and continuously record said continuously reproduced digital data in the same area of the disk.