Customer Review

16 of 16 people found the following review helpful
5.0 out of 5 stars Very fast card, marked as UDMA 7, May 22, 2012
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This review is from: SanDisk 32GB Extreme Pro CF memory card - UDMA 90MB/s 600x (SDCFXP-032G-A91, US Retail Package) (Personal Computers)
Do note that SanDisk periodically updates their cards while retaining the original name. I ordered my Extreme Pro 32GB on May 12, 2012 from another site (very reputable, authorized reseller, but will remain unnamed here).

My card is marked as UDMA 7 (see photo), which is a nice surprise, as on SanDisk's website, only the 128GB cards are marked as supporting UDMA 7. I'm not sure if it makes much difference, however, as the card is also marked as having a maximum speed of 90 MB/s. In the X speed rating that other manufacturers use, this is a 600x speed card. There are cards by other manufacturers that claim 1000x speed (150 MB/s) but I have not had the opportunity to test them. Interestingly, the box states "UDMA 6".

(UDMA 6 has a maximum transfer rate of 133 MB/s. UDMA 7 has a maximum transfer rate of 166 MB/s. And if anyone is curious, 1x is the speed a CD-ROM reads at audio CD data rate - 150 kB/s.)

There's also an interesting mark on the lower left corner of my card. It's an icon of a movie clapboard, with the number "20" in it. The box explained this to mean a guaranteed sustained 20 MB/s write speed when recording video.

Other than the card in a clamshell protective case, the only other item included is a slip of paper with the serial for a 1 year license of RescuePRO Deluxe. Like SanDisk's other premium lines (Ultra, Extreme and Extreme Pro), this card comes with a limited lifetime warranty - limited because the data is not covered, only the physical media.

I tested the read and write speed on my desktop computer (i7 920, 12GB RAM, PCIe USB 3.0 card with NEC chipset) with a Transcend USB 3.0 Super Speed Multi-Card Reader for SD/SDHC/SDXC/MS/CF Cards (TS-RDF8).

The card came preformatted in FAT32, and empty. There were no errors, as expected. h2testw fills up the entire cards with pseudo-random data, then reads them back to verify they care correct. In the process, it will report sustained read and write speeds.

The card managed 63.2 MB/s write and 84.3 MB/s read speed on my system. Not quite 90 MB/s, but a respectable part of it. Perhaps a different card reader might improve performance, but I'm happy with it. At this speed, it takes about 6 minutes to download a full card onto my computer.

When using a USB 2.0 card reader, I only get 23 MB/s read speed, so you'll definitely want a fast card reader if you're spending the extra money getting this card.

Testing on my 5D III (which supports UDMA 7) there's no problem, as expected. I'll do a comprehensive test on burst speed later.
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Showing 1-2 of 2 posts in this discussion
Initial post: Aug 13, 2012 3:07:21 AM PDT
Thank you for the detailed report!

Posted on Mar 6, 2014 2:24:31 AM PST
Wil G says:
Have you tested sustained burst yet?
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Lenny
(VINE VOICE)    (REAL NAME)   

Location: FREMONT, CA, United States

Top Reviewer Ranking: 1,533