Sony 64GB SDXC Class 10 UHS-1 R40 Memory Card (SF64UY/TQMN) (OLD MODEL)
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Sony 64GB SDXC Class 10 UHS-1 R40 Memory Card (SF64UY/TQMN) (OLD MODEL)
Now you can enjoy high speed memory cards recommended for DSLR cameras and full HD Camcorders. File recovery downloadable software helps recover photos and videos that have been accidentally damaged or deleted2.
Up to 40MB/s Transfer speed1Provides fast and easy photo and video transfer. Works with many devicesSD Memory cards can be used in any compatible hardw
- Up to 40MB/s transfer speed
- Compatible with multiple SDHC/SDXC hardware devices
- Recommended for DSLR Cameras and Full HD Camcorders
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The 1-star threads on the Transcend are like watching a committee of blind men describing an elephant. Unsurprisingly, no one has the complete picture, but a lot of Canon owners think these cards are bogus. SD card technology is very complex, the Class system is often misunderstood, and there is a long history of compromised cards appearing on eBay -- or even from reputable dealers who have been hoodwinked. Kingston cards are most often faked (or taken from the midnight production run); that's because Kingston has about a third of the flash card market and doesn't forge their own chips, but any manufacturer can be spoofed. It doesn't pay to buy cheap cards on eBay or less reputable sources.
An SD card contains a controller chip and flash memory chips, even the microSD versions. Realize that SD means Secure Digital, and that security comes from crypto managed by the controller (MMC cards didn't have that bloat, but Hollywood DRM requirements made sure they faded). The controller can be pretty powerful: the Samsung SD controller is a 32-bit ARM TDMI chip with 128 k of code space -- that's cell phone power. It handles I/O and fading (when the card slowly wears out its NAND sites after about 100,000 hits so writing is randomly distributed and kept track of), the factory self-test, and a host of other functions, but it can also be programmed to report a false storage capacity. Sometimes the firmware on the controller or its crypto or something else on certain cards leads to problems with certain hardware, as it has, for example, with the Samsung Galaxy III and maybe the Canon cameras. Usually the card is found to confirm to SDcard dot Org specifications and the hardware is to blame, but you never know.
To test the actual capacity of your card, use H2testw, which is free. It writes the full amount of data to the card and then reads it back (this nukes whatever was on the card). This can take more than an hour with a 32 GB card but it tells you if the card indeed holds 32 GB or if it has problems. H2testw also gives you read and write speed numbers, but it's unclear whether the numbers are for random read/write, or sequential read/write or a mix. Sequential write is what photographers and videographers most care about.
Sometimes a Class 6 card might appear to test faster than a Class 10 card, when using computer read/write tests or even in a camera that wasn't designed with higher capacity cards in mind. That's because such cards use smaller block sizes (there's no cache on an SD card). Explaining the significance of this is getting too far into the weeds for an Amazon review, and modern devices and their firmware should not have that limitation.
To test random and sequential read/write speed, use CrystalDiskMark, also free. Run the full suite; it won't take long. CrystalDiskMark requires that the card be formatted, and the most reliable way to do that is to use the free tool from sdcard dot org. A 32 GB card will may report 39.9 GB before formatting and 29.8 GB after; don't worry, you haven't been ripped off.
Unfortunately, there's no easy way to read the manufacturer's ID off the SD card, even in Linux, to determine who actually made the card, because you have to have the card connected directly to a motherboard; an SD-to-USB adapter won't work because it doesn't pass through disk data, and that's what's in nearly all computers. But what do you care, so long as the card's as big and fast as claimed?
Now, what about the Transcend 32 GB SDHC C10 card? Here are full test results from CrystalDiskMark:
Transcend 32 GB SDHC C10
CrystalDiskMark 3.0.2 (C) 2007-2013 hiyohiyo
Crystal Dew World : [...]
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 19.953 MB/s
Sequential Write : 13.786 MB/s
Random Read 512KB : 19.618 MB/s
Random Write 512KB : 13.827 MB/s
Random Read 4KB (QD=1) : 3.003 MB/s [ 733.2 IOPS]
Random Write 4KB (QD=1) : 1.414 MB/s [ 345.1 IOPS]
Random Read 4KB (QD=32) : 3.491 MB/s [ 852.3 IOPS]
Random Write 4KB (QD=32) : 1.842 MB/s [ 449.8 IOPS]
Test : 50 MB [F: 0.0% (0.0/29.3 GB)] (x5)
Date : 2013/05/12 18:19:47
So you can see that the sequential write speed, what matters to a photographer or videographer, is over 13 MB/s, more than 30% above the C10 spec. The other speeds aren't too shabby, either. There's no way that this card is too slow for a contemporary camera, still or video, that is functioning and designed properly.
Also on...Read more
After receiving this card, I tested it against a bunch of other SD cards in my personal inventory. Note that there is some room for error (due to hand/stopwatch reaction time). Nevertheless, it's a good relative overview. I tested using a UHS-1 capable reader and files of known size. Here's a summary of the results:
Sandisk Extreme SDHC (45 MB/sec label)
READ: 44.9 MB/sec (with bursts above 50 MB/sec)
WRITE: 34.32 MB/sec
Sony 32GB SDHC UHS-1 R40 (the card being reviewed here)
READ: 39.61 MB/sec (with significant initial burst of over 100 MB/sec)
WRITE: 19.07 MB/sec
PNY "Professional" 16GB, (20 MB/sec label)
READ: 14.78 MB/sec
WRITE: 20.74 MB/sec
Patriot LX Class 10 16GB memory card (from Fry's Electronics)
READ: 11.15 MB/sec
WRITE: 19.79 MB/sec
Sandisk Ultra, with UHS-1 label
READ: 36.76 MB/sec
WRITE: 10.67 MB/sec
And just for fun--here's what a number looks like for an older compact flash with UDMA controller:
Sandisk Extreme IV 4 GB compact flash
READ: Not tested
WRITE: 33 MB/sec
So, as you can see, while this Sony card is not the fastest performing card out there, it's performance is still quite good in the latest gear. Also, a quick word about video and transfer rates. Digital video is recorded in "megaBITS" per second, while these cards are speed rated in "megaBYTES" per second. That makes it a bit confusing. At the moment, digital SLRs from the factory are at about 24 up to 100 megabits/second in terms of their video rate. To convert bits to bytes, divide by 8...so that becomes 3 MB/sec to 12.5 MB/second. For most digital SLRs out there, even the Sandisk Ultra is fast enough for video, but if your camera has a high bitrate option, this Sony has enough headroom for sustained file writing. The Sandisks are still king of the mountain, but they do cost more. Sandisk has long underrated their higher end cards; even older Sandisks are often faster than newer cards from other makers (like the older compact flash example above). If you absolutely need the higher performance, go with the Sandisk Extreme or Extreme Pro, but you'll pay for it. From my own numbers, I'm comfortable with the Sony for day to day use for my D800. If I really need speed though, I'm going with compact flash over SDHC.