As a 2nd system hard drive for systems that support the Bay Adapter
Note:
R60, R61, T60, T61, X60, X61, Z60m, Z61m, Z60t, Z61t: The data transfer rate will slow to 1.5 GB/sec when using ThinkPad 3.0 GB/sec SATA (Serial ATA) Hard Disk Drive
X60, X60x, X60 Tablet, X61, X61s, X61 Tablet: For 2nd HDD support in the ThinkPad X6 UltraBase, the ThinkPad Serial Hard Drive Bay Adapter is required. These drives are also supported as the primary hard drive upgrade for usage in the X60, X61 systems.
Publications - Instruction manual for your product
Lenovo Support: Hard Drives: Reference Guide - A list of other internal and external notebook hard drives. Also has additional information which includes: User Handling Tips for Hard Drives, Lenovo Hard Drive Quick Test, Avoiding Hard Drive Damage, and Lenovo Hard Disk Drive Retention program information.
Hard Disk Drive Retention ( www.lenovo.com/services/hddretention ) - Describes Lenovo Hard Disk Drive Retention service offering. If the internal hard disk drive (HDD) or internal solid state drive (SSD) fails during warranty, Hard Disk Drive Retention lets customers keep the old drive and hold on to personal or business data.