DESC: The ThinkPad Serial Hard Drive Bay Adapter gives you maximum storage flexibility enabling you to add a second ThinkPad notebook Serial ATA hard disk drive into the Ultrabay media bay of systems supporting Serial ATA drives. With the second HDD in your Ultrabay, you have the fastest way to back-up key applications and critical data. Product Features: Compatible with ThinkPad Z Series notebooks; Enables additional storage expansion; Allows you to add a second ThinkPad notebook serial ATA hard disk drive to systems supporting the modular bay; And it's backed by a Warranty by Lenovo with renowned Service and Support available from IBM.