Saturday, June 20, 2015

SD card write speed comparison

Gear

SD Cards
    1. SanDisk Extreme Pro 32GB 95 MB/s
    2. SanDisk Ultra 64GB 40 MB/s
    3. Transcend 32GB 30 MB/s
    4. #1 but with duplication on (writes to both cards simultaneously)
    5. #2 but with duplication on
    6. #3 but with duplication on

Camera

    • Nikon D7000


Test

  • Number of shots in 30 seconds when shutter is held depressed in high-speed mode
  • All testing done with newly formatted cards


Result

  1. 47 shots
  2. 46 shots
  3. 24 shots
  4. 35 shots
  5. 27 shots
  6. 18 shots

The 40 MB/s card is likely writing to disk fast enough that it isn't filling the camera buffer, which makes it look identical to the 95 MB/s over 30 seconds without duplication. A longer test would likely reveal a difference.

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