This Hard Drive Adapter lets you add a second hard drive to the laptop systems. Maximizes storage flexibility. With a second hard drive, you can quickly store and back up critical data. Support hard disk: 2.5 HDD, SATA, SATAII SDD. Caddy Thickness: 12.7mm. With a second hard drive, you can quickly store and back up critical data. Add this caddy to your laptop to give you another hard drive. Simply remove your CD/DVD-ROM drive and put the Caddy (with the added hard drive) in its place. Support: SATA Support hard disk: 2.5 HDD, SATA, SATAII SDDCaddy Thickness: 12.7mmHow to use: Unpack the New drive, lift the adapter retaining latch, the screw to the hard diskInsert the drive into the Adapter at an angleSlide the drive into the connector until it locks into placeLower the adapter retaining latch until it snaps closed.