Patent ID: 7231278

Claim:
An automated data storage library, comprising: a plurality of storage shelves for storing portable data storage media; at least one data storage drive for transferring data with respect to said portable data storage media; a plurality of accessors which separately access and transport portable data storage media with respect to said plurality of storage shelves and said at least one data storage drive, along at least one path, and which interfere with one another along said at least one path; a work queue of commands for operating at least one of said plurality of accessors; and a library controller for operating said plurality of accessors, said library controller: detects restricted movement of one of said plurality of accessors at a position along said at least one path; determines a limit extending to commands of said work queue, said limit from and past said position of said accessor having said restricted movement, along said at least one path; and prevents execution of said limited commands.