My Passport™ SSD 4TB WDBAGF0040BGY-WESN Save, access and protect the content that matters to you with My Passport™ SSD, giving you read speeds of up to 1050MB/s and write speeds of up to 1000MB/s with NVMe™ technology. Specifications: Capacity 4 TB Interface USB 3.2 Gen 1 Connector USB-C Compatibility Windows® 10, Windows 8.1 operating systems macOS Big Sur, Catalina, Mojave, or High Sierra Requires reformatting for other operating systems Compatible - USB 3.2 Gen-2 and USB-C (USB-A for older systems) Dimensions (L x W x H) 3.94" x 2.17" x 0.35" Sequential Read Performance 1050MB/s Sequential Write Performance 1000MB/s In The Box Portable SSD drive USB Type-C™ to Type-C cable (supports USB 3.2 Gen 2) USB Type-C to Type-A adaptor WD Discovery™ software for backup, and password protection (Internet activation required)