The Seagate ST4000NM0125 4TB 7200RPM 12Gb/s SAS 3.5" HDD is a high-performance internal desktop drive designed for use with PCs. With a storage capacity of 4TB and a rotation speed of 7200 RPM, this drive offers fast data transfer rates and ample storage space for a variety of tasks. The drive features a sleek silver design and a 3.5-inch form factor, making it compatible with most desktop configurations. With a cache size of 128 MB and support for HDD drive types, this Seagate Enterprise drive is a reliable and efficient choice for expanding storage capabilities.