Hitachi 5K500.B-250, HTS545025B9A300 (0A70372, DA2959)

Overview
Lenovo P/N 45N7009 (FRU 69Y4757), bundled with at least some Thinkpad X120e netbooks

"220 0A90161 01" is etched onto the bottom layer of this particular drive's board.
 * 0A70372 is the Hitachi P/N. DA2959 is the MLC.