The Seagate ST4000NM0125 4TB 7.2K SAS 12Gb/s HDD is a high-capacity internal hard disk drive designed for use with PCs. With a rotation speed of 7200 RPM and a storage capacity of 4TB, this SEAGATE Constellation model offers fast data access and transfer rates. The drive features a SAS interface and 128MB of cache, making it ideal for demanding storage needs. Its 3.5-inch form factor and silver color make it a sleek addition to any computer system. Made in Thailand, this HDD unit is reliable and efficient for storing large amounts of data.