Installed in a Nikon Z6, the CFExpress initially required formatting to be recognized by the camera. Although it is always recommended to format a card before use, it is unusual for a card to arrive unformatted.

Once the card is formatted, the huge capacity is recognized by the camera without any problem; for most people, the scale of storage on this card alone will probably be enough for a lifetime of images.

Even for videographers, the massive 512GB card size will see the most enjoyment for around four hours of high-quality 4K video capture.

In use, the card met the camera’s requirements, and at no time was there any glitches, dropped frames, or camera pauses due to issues of writing.

After the real world test where the card performed as I expected, it was time to get a little more scientific and put the card through the Blackmagic Disk speed test with the following results.

Write 625.1 MB/s
Read 883.7 MB/s

Although these results are far from those announced by Sabrent, the results are still excellent. It’s also worth pointing out that the transfer speeds of these cards are also limited by technology, with the card reader only having a maximum transfer rate of 950MB/s over USB 3.2.

Letting the card run in Blackmagic for a few hours to see the effects of sustained use, the card held up well with no noticeable drop in performance. As with other CFExpress cards of this type, the heat generated over the hour begins to accumulate, but the performance is stable.

Overall in camera and tested through the Disk Speed ​​Tool, the Sabrent CFExpress B 512GB card proved to be a very good performer.


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