Methods, systems, and machine-readable media are disclosed for distribution of processing of large amounts of data. The p-type junction barrier region includes a p-type polysilicon region forming a P-N heterojunction with the drift region, and the p-type junction barrier region is electrically connected to the contact. After receiving this report of an unrecoverable read error, rather than simply switching over to a mirror, the RAID controller first checks to see whether the disk that caused the error can successfully reassign an LBA. The first NMOS transistor has a drain electrode connected to the drain electrode of the first PMOS transistor and a gate electrode sat as a first input terminal.