RoHS stands for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products (known as EEE). All applicable products in the EU market after July 1, 2006 must pass RoHS compliance. The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), and four different phthalates (DEHP, BBP, BBP, DIBP). RoHS Origin Storage 1TB SATA 5.4K Opt 790/990MT 3.5in Hybrid HD Kit w/ Caddy, 1 TB, 5400 RPM, 64 MB, 3.5", Serial ATA III Origin Storage 1TB SATA 5.4K Opt 790/990MT 3.5in Hybrid HD Kit w/ Caddy. HDD capacity: 1 TB, HDD speed: 5400 RPM, Storage drive buffer size: 64 MB, HDD size: 3.5", Interface: Serial ATA III, Hybrid-HDD cache memory: 8 GB