Hi All...
Recently, I purchased several pair of chips on eBay. I always test them. Here is what I found...
In Pic1 is a Sandisk Counterfeit Extreme Pro 64GB U3. Came out of the Midwest... The serial number on the back of the chips are: MMB3D08BUACA-GE. As you buy on line, don't buy if the back type resembles these numbers and their format. In a test, they locked up my Mavic within 30 feet of the takeoff point... More digging revealed the following test results with Speedoff:
-----------SpeedOut Result File-----------
Drive name: Ô
(N 
Read test: QT 1: 15.537 MB\s QT 2: 15.384 MB\s QT 3: 15.384 MB\s QT 4: 15.384 MB\s ------------------- TOTAL: 15.422 MB/s
Write test: QT 1: 4.533 MB\s QT 2: 3.921 MB\s QT 3: 4.651 MB\s QT 4: 4.664 MB\s ------------------- TOTAL: 4.419 MB/s
Checked on 10.08.2017
Pic2 is worse. In Pic1 is a Samsung Pro+ 128 GB U3. Came out of PA. There are 5 separate listings on eBay... The serial number on the back of the chips are: MMSCGS8SJRSS-TB. Speedcheck is slower than the other one. Also locked up Mavic and Inspire... Inside tests.
As you buy on line, don't buy if the back type resembles these numbers and their format.
Both sellers were informed and refunded me. Probably a bogus wholesaler sold to them.
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Pic1 
Pic2 
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lvl.1
Second Officer
How much were they, and from what country? So what did they do to the Mavic??? Safety First! Ken.