SD card to computer performance

This post is a brief overview of read and write performance of several SD cards that may be of interest to photographers with cameras that do not take advantage of high performance of the latest SD cards, but who have newer computers with an USB3 port.

Used cards

Type Capacity Nominal speed Technology
Lexar Professional 600x 16GB SDHC UHS-I 16GB 90MB/s SDHC
Lexar Professional 600x 64GB SDXC UHS-I 64GB 90MB/s SDXC
Lexar Professional 2000x 64GB SDXC UHS-II/U3 64GB 300MB/s SDXC
SanDisk Extreme 16 GB SDHC Class 10 UHS-1 16GB 45MB/s SDHC
SanDisk Extreme Pro 32 GB SDHC – UHS Class 1 32GB 45MB/s SDHC
SDHC_16GB_600x SDXC_64GB_600x Pro_2000x_SDXC_64GB_wRdr sd-extreme-16 sd-extreme-pro-32


The read and write performance was determined using internal SD card reader in 2013 MacBook Pro and Lexar USB3 card reader attached to USB3 port. All cards were formatted with SD Formatter, which uses FAT32 and gives the best in camera performance.  This mini test uses BlackMagic Disk Speed Test.



Final thoughts

Even if 45MB/s is plenty of speed for many cameras and shooting scenarios, using cards like the Lexar Professional 2000x 64GB SDXC UHS-II/U3 will provide 6x faster card to camera read time. This may be compelling for photographers with large amount of images and aggressive timeline or for those who want to cull the images on the card prior to downloading to their editing program.


sdxc64-2000 Disk Speed Test

Performance of Lexar Professional 2000x 64GB SDXC UHS-II/U3 with the bundled reader as measured in BlackMagic Disk Speed Test



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