The HP High-Performance Secure Hard Disk (B5L29A) is an encrypted hard drive accessory for HP LaserJet and Color LaserJet Enterprise printers. It adds secure internal storage for stored print jobs, scans and fonts, helping protect sensitive documents in shared printing environments. The drive is FIPS 140-2 validated and comes mounted in an HP carrier that slides into the printer's hard drive slot, with an installation guide in the box. It is listed as compatible with the Color LaserJet Enterprise M553 series (including Managed M553dnm and M553xm) and the LaserJet Enterprise M604, M605 and M606 series, including the Managed M605 models. Check your printer model before ordering, as this drive is designed for these specific HP enterprise printers. After comparing online prices, www.marvel.co.za should be the cheapest on this product.