In this test, I used the Sony A73 for the most part. The small Manfrotto Pro Rugged UHS-II SD card kept up with the camera to shoot video and stills.
The write speed worked well for continuous shooting, and there was no noticable lag as the cache waited for the card to catch up.
Likewise shooting 4K 30fps video with all settings set as high as they would go, the card kept up for the 29 minutes of video recording without issue.
All real-world tests out of the way and it was time to check out the read-write speeds using the Blackmagic Disk Speed Tool. The results of this were excellent coming in at:
Read = 245MB/s
Write = 218MB/s
So far so good, but then this cards sells itself as being tough. So the next test was to freeze the card overnight in a standard domestic freezer with a bag of frozen peas popped on top for good measure.
After a night in the freezer and a quick -19 blast from the quick freeze, it was time to check out the performance again. Not sure if it needed defrosting before the test, so I decided to test it frozen and then defrosted for good measure.
Frozen Results
Read = 252MB/s
Write = 218MB/s
Defrosted results
Read = 253MB/s
Write = 205MB/s
After the test the weather looked as if it would snow heavily for 48 so carefully marking a position on the garden table with a cane I left the card out to survive the elements of nature for the night.
In the morning the weather forecast proved to be completely wrong, the marker had fallen over and the card was still clearly visible on the table with the lightest smattering of snow.
Temperature-wise I think it dropped to -3, well within the limits of the small card which worked fine when tested.
Applying 20kg of force to a memory card is pretty difficult in a home environment – so rather than checking the force I opted to throw it from a 3rd-floor window and check out to see if it survived.
It did and running the test, and the results were almost identical.
Finally, the test that wipes out most SD cards and that’s the water test. Manfrotto state 72-hour protection from being submerged, so only one way to test and that’s to drop it into a bowl of water for 24 hours. I feel this is long enough before I forget that it’s there.
Again, do I let it dry out fully or wipe it down and test it?
Wiped dry and test
Read = 253MB/s
Write = 219MB/s
Left for a day to dry out
Read = 253MB/s
Write = 221MB/s