1. A method of rebuilding data stored on a dispersed data storage network comprising a plurality of networked computers including a plurality of slice servers, each of said slice servers storing a plurality of data slices, each of said data slices being identified by a data slice identifier, whereby n of said data slices are associated with a corresponding data segment, and whereby m of said associated data slices are required to reconstruct said corresponding data segment, and further whereby m is less than n, said method comprising the steps of: receiving a message from one of said networked computers, said message indicative of the inaccessibility of a plurality of data slices; adding data slice identifiers identifying said plurality of data slices to a list of data slices to be rebuilt; for each data slice identified by said list of data slices to be rebuilt: determining a corresponding data segment; reading at least m data slices associated with said corresponding data segment, said at least m data slices not identified on said list of data slices to be rebuilt; reconstructing said corresponding data segment from said at least m data slices; slicing said reconstructed corresponding data segment into n data slices, including said data slice identified by said list of data slices to be rebuilt; and writing said data slice identified by said list of data slices to be rebuilt to one of said plurality of slice servers.