Professional hard disk for PC or Mac, with super-fast Thunderbolt 2 and USB3.0 interfaces. Includes Thunderbolt cable Up to 220MBps average transfer rate is possible - and it's possible to push speeds to up to five times faster by installing the LaCie d2 SSD Upgrade (sold separately). A unibody aluminium construction reduces noise and vibration (typical noise level is just 28dB). It also draws heat away from the hard disk, and with the base, which also acts as a heat sink, eliminates the need for a fan. Dual Thunderbolt 2 ports let you daisy chain up to six devices to a single Thunderbolt port on a computer (e.g. a 4K monitor and up to 5 d2 drives).