This NETGEAR RND4000-100NAS desktop network attached storage solution comes with four drive bays and a USB 3.0 specification for fast data transfer. The unit supports HDD drive types and has a write speed of 4x. It also features an Ethernet interface and auto power on/off capabilities, making it a great choice for home or office use. The sleek silver design fits in with any decor and the compact size of 9\" x 8\" x 5\" makes it easy to place in any available space. Please note that this product contains a chemical known to the State of California to cause cancer, as indicated by the California Prop 65 Warning.