If you’re looking for a huge amount of portable storage, which you can copy to and from at high speeds, Amazon has a 500GB Crucial X6 portable drive on sale for just $49.99 today. That’s less than I paid for two whiskey sours at a Manhattan bar a few weeks ago…and since the SSD got a PCWorld Editor’s Choice award, it’s probably a much better investment. In our review, Jon L Jacobi praised the drive’s pocket-friendly design and solid performance, though the SATA drive does tend to struggle if you move enough files to fill up its temporary cache. With a transfer speed of 375 megabytes per second…