Those 80,000-plus glowing reviews you see on the SanDisk Extreme Portable SSD's Amazon page aren't there by coincidence. The compact, rugged, and ultra-reliable drive is the must-have standard for buyers ranging from professional videographers and other content creators to business travelers who value a SSD that's small in physical stature but huge in storage capacity to smart everyday consumers who see the wisdom in backing up their most valuable digital files.