This drive bay can hold a 2.5" SATA hard drive, for any models with a 12.7mm thickness Ultrabay slim drive, also for Ultrabay enhanced bay.

The ThinkPad Serial ATA Hard Drive Bay Adapter II Ultrabay Enhanced II lets you add a second hard drive to the Ultrabay of your ThinkPad T and R series. With a second hard drive, you can quickly store and back up critical data.
 

Plus a USB 2.0 External Cable to enable the module or optical drive to be used externally

High quaility product,Brand new.

This device accept 2.5"/9.5mm SATA HDD (works great with a SSD hard) .

Dual boot, Support installation of 2nd operating system on the 2nd HDD and boot selection.

Plug & Play, Supports hot swapping.

Fast & Reliable connection in ThinkPad, just as the primary HDD.

Fully integrated into ThinkPad laptop, no cables/PSU/software driver needed .

Replacement Part, Third-party factory produce. 

Compatible Lists:

 IBM ThinkPad Lenovo

T420 T420i T520 T520i T530