Recording and playback apparatus and recording and playback method
AssigneeSony Corporation
InventorsMasaki Yamada, Nobuhisa Toshitani, Masayuki Hoshi
Life of this patent
Estimating the term…
Abstract
A schedule-controlling unit selects a file whose remaining time for playback is the shortest among files to be restored and compares the remaining time for playback of the selected file with a reference time set in advance. When the remaining time for playback is longer than the reference time, the schedule-controlling unit again selects a file in which a distance parameter of a partition of unrestored data to be subsequently restored is the lowest among files to be restored. A restoring unit restores unrestored data of one partition of the file selected by the schedule-controlling unit.
Claims12
A recording and playback apparatus comprising:
- magnetic tape drive means for reading/writing a data file including a plurality of data in units of recording regions which are formed by dividing a magnetic tape in each of a plurality of tape cartridges, each recording region having a predetermined capacity;
- tape cartridge changing means for accommodating the plurality of tape cartridges, selecting a specific tape cartridge from among the plurality of tape cartridges, and conveying the selected tape cartridge to the magnetic tape drive means;
- hard disk drive means including a hard disk having at least a cache area which is used when the magnetic tape drive means reads/writes the data file;
- and
- control means including at least a schedule-controlling unit which selects a data file whose remaining time for playback is the shortest when a plurality of different data files on the magnetic tapes in the plurality of tape cartridges are played back while the data files are sequentially written on the cache area of the hard disk, the remaining time for playback being calculated based on a currently played back position and a writing end position in the cache area on which data of a predetermined number of recording regions is written.
A recording and playback method using a recording and playback apparatus comprising magnetic tape drive means for reading/writing a data file including a plurality of data in units of recording regions which are formed by dividing a magnetic tape in each of a plurality of tape cartridges, each recording region having a predetermined capacity;
- tape cartridge changing means for accommodating the plurality of tape cartridges, selecting a specific tape cartridge from among the plurality of tape cartridges, and conveying the selected tape cartridge to the magnetic tape drive means;
- and hard disk drive means including a hard disk having at least a cache area which is used when the magnetic tape drive means reads/writes the data file, the method comprising:
- selecting a data file whose remaining time for playback is the shortest when a plurality of different data files on the magnetic tapes in the plurality of tape cartridges are played back while the data files are sequentially written on the cache area of the hard disk, the remaining time for playback being calculated based on a currently played back position and a writing end position in the cache area on which data of a predetermined number of recording regions is written.
Dependencies are inferred from the claim text.