Actually, there is little consistency in the advertised size of flash drives.<p>USB sticks are predominantly sold in base-2 sizes (32, 64, 128 GB etc). In fact, I don&#x27;t think I&#x27;ve ever seen a 30GB or 100GB usb disk.<p>How SSD sizes are advertised depends entirely on the manufacturer, and even manufacturers don&#x27;t use a single base: Samsung&#x27;s EVO series are advertised in multiples of 10 (250, 500GB), while its PRO series use sizes in multiples of 2 (256, 512GB). Sandisk uses 120 GB, 240 GB sizes. I&#x27;m not even sure if all those sizes are supposed to represent base-10 or base-2 prefixes.