The ThinkPad Serial ATA Hard Drive Bay Adapter III lets you add a second drive, hard disk drive or solid state drive, to the ThinkPad Ultrabay. With a second drive, you can store more data, and also back-up critical data. The ThinkPad Serial ATA Hard Drive Bay Adapter III is supported in the following ThinkPad systems: R400, R500, T400, T400s, T410, T410s, T500, T510, W500, W510, W700, and W701. Using the optional ThinkPad X200 Ultrabase (43R8781), the ThinkPad Serial ATA Hard Drive Bay Adapter III is also supported with the following ThinkPad systems: X200, X200s, X200 Tablet, X201, X201s, and X201 Tablet.Easy to install or remove in ThinkPad systems Supports selected hard disk drives (HDD) or solid state drives (SDD) Installs in the Ultrabay of the ThinkPad X200 Ultrabase (43R8781) For more information on accessories, including compatibility, go to: www.lenovo.com/accessoriesguide For more information, go to: www.lenovo.com/support/notebook/harddrives