The Western Digital WD4000FYYZ RE 4TB SATA III 7200RPM 3.5" internal HDD is a high-quality storage solution suitable for both PC and Mac computers. With a rotation speed of 7200 RPM and a cache size of 64MB, this silver-coloured drive offers fast and efficient data processing. The 4TB storage capacity provides ample space for storing large files and applications, while the removable features add flexibility to your setup. Made by Western Digital, a trusted brand in the industry, this HDD is reliable and durable for long-term use.