The S358BU33ERM 8-bay removable hard drive enclosure lets you access eight individual 2.5" or 3.5" hard drives simultaneously using a single e SATA or USB (Universal Serial Bus) port. For fast performance & efficient data transfers when connected through e SATA, the HDD enclosure supports full SATA III transfer speeds -- up to 6 Gbps. For universal compatibility, the enclosure can be connected through USB (Universal Serial Bus) 3.0 with transfer speeds up 5 Gbps plus support for UASP, which supports performance up to 70% faster than conventional USB (Universal Serial Bus) 3.0 when paired with a UASP-enabled host controller to utilize the full potential of your SATA III hard drives. See our UASP testing results below for further details. The HDD enclosure supports the fastest drive technologies including SATA III (6 Gbps), hybrid drives and solid state drives (SSD), helping save you time through optimized performance from your external storage devices. To help protect your drives the HDD/SSD enclosure has a built-in fan that keeps your drives running at optimal temperatures. Plus, the metal drive trays ensure maximum heat dissipation. To ensure compatibility with your computer system, the S358BU33ERM supports all of the leading operating systems, including: Microsoft Windows (8/7/ Vista/XP/ Server 2008/ Server 2003), Apple OSX (10.9/10.8/10.7/10.6), Linux, & Google Chrome OS™. The S358BU33ERM is backed by a Star Tech.com 2-year warranty & free lifetime technical support. enhanced Performance with UASP UASP is supported in Windows 8, Mac OSX (10.8 or above), & Linux. In testing, UASP performs with a 70% faster read speed & 40% faster write speed over traditional USB (Universal Serial Bus) 3.0 at peak performance. The Star Tech.com Advantage Versatile connectivity options, through either USB (Universal Serial Bus) or e SATA Maximize performance, with SATA III file transfer speeds up to 6 Gbps using e SATA Save time, with file transfers up to 70% faster than traditional USB (Universal Serial Bus) 3.0 when used with a UASP-supported host