The Seagate Exos 7E8 ST4000NM0035 4TB 3.5" SATA NAS Hard Drive is an internal desktop drive designed for high-performance storage. With a rotation speed of 7200 RPM and a storage capacity of 4TB, this HDD is compatible with PC, Mac, and memory vault systems. The drive features hot swap and removable capabilities, making it ideal for use in NAS environments. The Seagate IronWolf product line ensures reliable performance, while the 128 MB cache enhances data transfer rates up to 40 Mbps. This silver-colored hard drive is a dependable choice for expanding storage capacity in various systems.