LaCie 4TB d2 Professional USB C External HDD The essential addition to SSD-based laptops and all-in-one computers with limited storage capacity, the latest d2 USB-C desktop drive massively expands capacity to up to 10TB for professional bandwidthintensive creative applications. The LaCieÆ d2 Professional performs perfectly on Macs and PCs alike and also features Seagate BarraCuda Pro enterprise-class hard drives for industry-leading performance and reliability.