Western Digital 12TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD121PURZ Digital Storage Capacity 12 TB Hard Disk Interface Serial ATA Connectivity Technology SATA Brand Western Digital Special Feature Data Recovery Service Hard Disk Form Factor 3.5 Inches Hard Disk Description Mechanical Hard Disk Compatible Devices Windows/Mac Installation Type Internal Hard Drive Color Purple