Seagate Momentus ST4000LM016 internal hard drive 2.5" 4000 GB Serial ATA III

Big Storage in a Small Package! - Highest-capacity mobile hard drive for DIY external box setup for upgraders - Each drive can store more than 1 million songs or 480 hours of HD video - Consumes less power than Seagate and competitive 3.5-inch desktop HDDs - Size matters. At 2.5 inches, it’s smaller than your regular 3.5-inch desktop HDD, yet delivers a whopping 4 TB of capacity to satisfy your need for storage - Perfect size for external box setup for upgraders and ultra-slim desktop HDD setup or replacements
Best-Fit Applications - External storage - All-in-one PC storage - Ultra-slim desktop storage