A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. The photoluminescent plate includes a base layer and a first phosphor layer. The optical storage medium has at least a polarization-sensitive member having the photo-induced birefringence property, such as a member made of polyester polymer having cyanoazobenzene as a side chain. Also provided are a memory subsystem and a computer system for performing the method. The secondary fuel and oxygen are added to the dirty exhaust in the gasifier creating gas and ash.