HGST Ultrastar 7K4000 HUS724020ALS640 2 TB 3.5 Internal Hard Drive SAS - 7200 rpm - 64 MB Buffer (0B26887) HGST Ultrastar 7K4000 HUS724020ALS640 2 TB 3.5 Internal Hard Drive SAS - 7200 rpm - 64 MB Buffer (0B26887) HGST 0B26887