Genuine Panasonic Toughbook 256GB Solid State Hard Drive for Toughbook 31 MK1 and Toughbook 31 MK2 CF-K31SD2511 Genuine Replacement Hard drive.

This hard drive comes already in the caddy/case made by Panasonic to slide right into the Toughbook 31 MK1 and MK2, you can simply remove your old hard drive and slide this one in.