Rebuilding data while reading data in a dispersed storage network

A computing device of a dispersed storage network (DSN) comprises:

• an interface;
• memory;
• and
• a processing module operably coupled to the memory and the interface, wherein the processing module is operable to:
• execute a read request regarding a set of encoded data slices stored in storage units of the DSN, wherein a data segment of data is encoded in accordance with a dispersed storage error coding function to produce the set of encoded data slices, and wherein a decode threshold number of encoded data slices of the set of encoded data slices is required to rebuild the data segment;
• reconstruct the data segment from at least the decode threshold number of encoded data slices of the set of encoded data slices, wherein the at least the decode threshold number of encoded data slices are included in read responses from the storage units;
• determine an encoded data slice of the set of encoded data slices not used in the reconstructing needs to be rebuilt;
• and
• rebuild the encoded data slice using the reconstructed data segment.