The 2TB WD20NPVX 5400RPM 6Gbs SATA 2.5" Internal HDD Hard Drive is a high-capacity hard drive designed for use in laptops. With a rotation speed of 5400 RPM and a cache size of 8 MB, this Western Digital drive offers fast read speeds of up to 500MB/s. The drive is compatible with SATA III interface and is part of the WD Green product line, making it a reliable choice for storage needs. With a storage format of HDD only, this unit provides ample space for storing large files and applications.