100% Brand New & Never Used Item. The height of this adapter is 12.7mm. HDD Interface: SATA (2.5" sata or ssd drives). Laptop/ Mother Board Interface: SATA. The 2nd Hard Disk Drive Caddy / Adapter to bring you new maximum data storage flexibility. With the second HDD in your Laptop， You can speed to backup important applications and critical data ( Simply remove your CD-ROM drive and put the Caddy (with the added hard drive) in its place. Replacement Part Third-party factory produce. Key Features: Plug & Play Fast & Reliable connection just as the primary HDD. Fully integrated into Laptop， no cables / PSU / software driver needed. Dual boot， Support installation of 2nd Operating System on the 2nd HDD and boot selection. Compatible: The Universal SATA-to-SATA Caddy is compatible with laptops that has a 12.7mm-thick / high optical bay with a SATA interface.