The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1994
Filed:
Jun. 10, 1994
Kamal E Dimitri, Tucson, AZ (US);
Dennis L Willson, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An optical disk having its disk inventory at the picker level is disclosed. The library includes two library controllers and four pickers. Each library controller maintains a list of the storage media in the entire library, but has no disk location inventory. The library controllers are not coupled to each other. Each picker has exclusive access to a set of storage cells and internal peripheral storage devices. In addition, the picker controller for each picker maintains the disk location inventory for the disks accessible by such picker. During a failure condition which prevents one library controller from accessing a particular storage medium, the other library controller can be signalled to attempt to access such storage medium. The overhead associated with maintaining two identical copies of the inventory in the library controllers is therefore eliminated.