Brand Western Digital. Model Western Digital Purple Surveillance. Storage 8TB. HDD type SATA Internal HDD. RPM 5400RPM. Buffer 256MB. Form factor 3.5 Inch. Interface (Built-in) SATA 6Gb/s. Transfer Rate 213MB/s. Part No WD81PURZ. Weight 715gm. Color Purple Others DIMENSIONS (L x W x H): 147.0 x 101.6 x 26.1mm. Warranty 2 year.