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 Hybrid 500GB/4GB SLC 7200RPM 2.5" SATA, 500 GB, 7200 RPM, 32 MB, 2.5", Serial ATA II Origin Storage Hybrid 500GB/4GB SLC 7200RPM 2.5" SATA. HDD capacity: 500 GB, HDD speed: 7200 RPM, Storage drive buffer size: 32 MB, HDD size: 2.5", Interface: Serial ATA II, Hybrid-HDD cache memory: 4 GB