2.5" /9.5mm (PATA IDE) 2ND HDD HARD DISK DRIVE Caddy/Adapter For IBM LENOVO ThinkPad T40 T40p T41 T41p T42 T42p T43 T43p; Thinkpad X40 X41 with Ultrabase Dock Series; part number 62P4554 62P4553 41U3148 41N5661 08K6068 IBM brand Thinkpad Allows disk drive to be easily removable from Thinkpad Can be used to expand storage with second disk drive or SSD