Testing a Bakeey microSD card

Is the Bakeey Extreme 64GByte any good?

The claims

Hard to see specs

The rough surface makes it hard to identify the markings. But as far as I can see, it claims to have the following characteristics:

• 64 GByte capacity
• Class 10
• UHS: U3
• Video Class: V30
• Class A1
• UHS1 (Bus Logo: I)

The question is: What does it all mean, and can I test that?

I bought the set (card/adapter/reader (usb-c / usb-a) here from Banggood.

I use h2testw to test the capacity and read/write speed. So from the results, I can see:

• It really has the 64GBytes, so no fake that overwrites itself: OK
• Class 10: I get a 13,4MByte/s write speed, so it meets the class 10 specs: OK
• U3: With the supplied USB adapter, I could not get anywhere near 30MByte/s write speed. So for the moment the answer is: No!
• V30: Again not with my adapter: No!
• Class A1: That's 10MByte/s write speed and a low number of IOPS. So: Very likely OK
• I logo: With the UHS-1 logo, the bus speed can be 12,5 to 104 MByte/s: Again likely OK

The read-speed I got was 17,4MByte/s with the supplied USB Card reader. Again not fantastic, but ok for a class 10.


EDIT: I re-tested with an USB3 card reader. The results were somewhat better:

• 18.9MByte/s write rate
• 31,6MByte/s read rate

I wanted to try 4k video streaming in my Olympus OM-D, but with the Micro-SD to SD adapter, the camera reported a card error. So I have no way to verify the 30MByte/s claim. But I have a compatibility issue with either the card or the adapter and the Olympus camera.
No issues in a Macbook Pro with the same adapter, though. Seems like a real compatibility issue.

Bottom line

For the card and the two adapters, I paid 10 USD. That appears fair for the set, but cards with similar specs are available from Transcend or Kingston in the same price range. An ok deal, but no need to rush. For my camera, I'll stick with a SanDisk Ultra that guarantees 40MByte/s for 4K recording.
All in all nothing to write home about.