The best alternatives to GigaDrive are ULLtraDIMM SSDs, Bullet SSD, and Nifty Minidrive. If these 3 options don't work for you, we've listed a few more alternatives below.
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Bullet SSD is the ultimate portable external solid-state drive. It's ultra lightweight, can store up to 2TB of data, and has high read and write speeds of 500MB/s. It fits right on your key-chain for everyday carry, so you can use it whenever wherever.