SanDisk Extreme Portable SSD – 4 Terabytes For sale: SanDisk Extreme Portable SSD Brand new in box and unused. Specifications: • Capacity: 4TB • Read speed up to 1050MB/s • Write speed up to 1000MB/s • Water and dust resistant (according to the manufacturer's rating) • USB-C with Type-A adapter • Ideal for large files, video, and backup storage