Vivetronic 500GB 8MB Cache 5700PM SATA 3.0Gb/s 3.5" Internal CCTV DVR Hard Drive (TP42232A000500GA) - w/ 2 Year Warranty is a product made by major hard drive factory that manufactured for other companies (OEM Hard Drive Reseller/VAR) re-brand to make it appear as if they made it or for large volume special application or system integration.