Anti-reverse actuator mechanism
Selectively holding data in a buffer for defective backing store tracks
Self-archiving data recording
Key-accessed file organization Patent #: 4611272
ApplicationNo. 07/030393 filed on 03/26/1987
US Classes:369/30.09Specified order of contents information modification processing
ExaminersPrimary: Canney, Vincent P.
Attorney, Agent or Firm
International ClassesG06F 17/30 (20060101)
G11B 20/12 (20060101)
G11B 7/007 (20060101)
G11B 27/32 (20060101)
G11B 20/18 (20060101)
G11B 27/28 (20060101)
G06F 3/06 (20060101)
AbstractAn updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorded. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.