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TESTED: Sony 80GB CFExpress Type A Camera Storage Card (for Sony A1)

re: Sony A7R IV: Which High-Speed and High-Capacity SDXC Cards Are Best?
re: Fast Camera Card Storage for Sony A1: CFExpress Type A (NOT Type B), or SDXC

CFExpress is claimed to be incredibly fast. Sony claims the following for its insanely expensive Sony CFExpress Type A cards:

Read Speed: 800 MB/s Maximum (Burst)
Write Speed: 700 MB/s Maximum (Burst)

The qualifier there is “burst”.

For the test below, 1000 files were written, then read back, with the timing for each graphed, as shown below. Each file being 78.6MB, that’s right in line with a compressed Sony A1 raw file.

Write speed

The Sony CFExpress card can maintain burst write speeds of ~650MB/sec for about 110 files, which equates to 5+ seconds at 20 fps. That ought to satisfy most photographers most of the time.

But keep shooting continually, and write speed plummets to as low as 65MB/sec, oscillating mostly in the 90 to 180 MB/sec range once it is really pushed hard.

Average write speed:  291 MB/sec <=== WAY below burst speed
Average read speed:   785 MB/sec

Less clear is whether the card can “recover” from repeated bursts of ~110 files without breaking down in speed as seen (this was a continuous unrelenting test). Thermal throttling might be at work here.

Read/download speed

Read speed matters for playback and downloading the card. While that also drops with sustained usage,the average speed is fully satisfactory.


A much less expensive Sony TOUGH 128GB card can be had for a slightly lower price, and is rated at 300 MB/sec reads and writes, with a minimum writes speed of 90MB/sec. And without the hassle of buhing a Type A card reader.

Thanks for buying using these links or Sony CFExpress Type A @AMAZON.

Tested with the fill-volume command of diglloydTools DiskTester. Vertical axis is MB/sec. Horizontal axis = number of files written.

Susstained write and read speed for Sony CFExpress 80GB camera card
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