1. A method of rebuilding data on a dispersed data storage network comprising a plurality of slice servers and at least one grid access computer, said method comprising the steps of: i) accessing a data store holding a list of data segment identifiers, said data segment identifiers corresponding to data segments stored by said dispersed data storage network; and ii) for at least one data segment identifiers in said list of data segment identifiers: (1) identifying a list of slice servers potentially storing a data slice associated with said data segment identifier; (2) retrieving status data from each of said slice servers, said status data corresponding to a data slice potentially held by said slice server; (3) noting that at least one data slice holding data associated with a data segment has been compromised based on said status data.