Review on SanDisk Extreme 32 GB SDHC Class 10 UHS-1 Flash Memory Card - High Speed 45MB/s (Model: SDSDX-032G-X46) by Andrew Holman

Update July 9, 2014: I received another card and ran it through the same h2testw. This time I got 36.4 MB/s writing, 43.4 MB/s reading. Slightly faster than the previous example. The color is different - the yellow in the Revain photo is actually gold, so it's not as gross as I initially feared. Not that it really matters - we don't buy beauty cards. My original purchase of May 15, 2012 has worked flawlessly on my 5D III all along. This new map is for the 70D. The packaging remained the same and the back still says "X46". And it comes with an annual RescuePRO Deluxe subscription (serial number on a piece of paper). end of update. Sandisk Premium SD Card Short Description: SanDisk currently has 3 cards. SanDisk Ultra is their junior line (max. 30 MB/s). Extreme is in the middle here with 45 MB/s. Extreme Pro is rated at 95 MB/s. All premium cards come with a lifetime guarantee. This card also includes an annual subscription to RescuePRO (the serial number is on the slip inside the box). This card is a bit more expensive compared to other reliable and fast cards. Extreme Pro is about twice the price. You're paying partly for SanDisk's reputation and partly for its speed. I tested my card with Transcend's Ultra-Speed USB 3.0 SD/SDHC/SDXC/MS/CF Card Reader (TS-RDF8) connected to a USB 3.0 PCIe card (NEC chipset) on an i7- 920 with h2testw 1.4 was connected. Basically, I'm testing large sequential reads and writes. As expected, there were no errors. When delivered, the card was formatted as FAT32. I'm not sure if my Transcend reader supports UHS-I mode, which might explain my not being able to reach 45MB/s. I got a decent write speed of 34.8MB/s and a read speed of 40.7MB/s. I also tested it with my USB 2.0 reader and the read speed was only 19.5 MB/s. It follows that you need either a USB 3.0 reader or a Firewire 800 reader to take full advantage of the speed of transferring photos/videos to a computer. At twice the transfer rate, you save about 14 minutes (27 minutes vs. 13 minutes) for a full 32GB of data. No problem using it with my camcorder or DSLR. My camcorder works well with Class 4 cards, so it's not surprising that there are no problems with this card. I was able to record all videos with one frame on my Canon 5D III (5D III does not support UHS-I). I will test burst write speeds (RAW files) vs regular class 10 and update this review later. One weird thing about this card (made in China in case anyone is wondering) is that there is a sticker on the UPC. stating that it is an X46 package (intended for Asia, excluding Japan, Europe and Australia). Take it off and it says "A21" (America). I don't think there is a real difference in the card itself.