
This is a very fast card that is not only great for quick file transfers but can also be used as a phone or tablet card for such applications as well. When it comes to phones and tablets, not only is the transfer speed one of the most important things, but so is the amount of I/O the card can provide. Lots of class 10 cards have great transfer speeds but horrible, I mean horrible IOP, often 5 year old cards easily beat them in IOP. IOPs and 1668 IOP reads. This is an IOP speed that is slower than an SSD but much faster than an HDD. Keep in mind that some Class 10 cards yield 4 IOP entries and you can see why I'm impressed. The only card I've seen in IOP is the SanDisk Extreme Pro and it's very expensive and doesn't come in 64GB. Testing the third SanDisk I have, the 32GB Ultra, is almost funny as the Ultra only delivers 15 IOPS under the same conditions, making this card 30x faster. What does this mean for normal use? a target card that, while not officially having the highest data rate, actually performs much better in the real world. That's why it gets such rave reviews for speed (assuming you get a real one!). This was tested on my Dell Venue 8 tablet with the built in card reader. For the techies (if you've gotten this far I guess so): I actually use it to run Server 2012 VMs on a VMWare workstation and the performance is surprisingly good, I'd even call it fast! Full Crystalmark Drive rating under MB/s 4KB random read qd32 6.65MB/s write 1.92MB/s parameters 5 iterations 1000MB sample size.

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