Note: This blog article reflects my personal experience with particular consumer products. In no way this represents any recommendation. I'm not affiliated in any way with the companies mentioned, neither commercial nor private, with the sole exception that I'm just an ordinary customer.As I returned two of my SanDisk Ultra 32GB cards after they failed in my two GoPro HD Hero 3 Black Editions to the shop where I had bought them, I invested my money immediately into another brand, this time made by Transcend.
Interestingly, two 32GB microSD class 10 cards in a double set costs almost 30% less than what SanDisk asks for its Ultra microSD cards. Now that's a deal, even more so as Transcends boasts 16MBit/s writing performance on its pack ... and now compare this with SanDisk that does not give any numbers at all except its incredible large reading performance. If they would go for subbits per hour, they would get even much more inflated numbers.
Alas, it's still the old question: how do these Transcend cards perform in reality? But after my experience with SanDisk it can't get much worse. From the famous GoPro forum (cheers, Rambo, you're doing a great job!) I knew already that these Transcend cards may most probably be okay, so I jumped ship.
|2× Transcend 32GB microSD, class 10 package.|
So let's go straight to the measurement: writing performance with 32kBytes block transfer size. This is assumed to be the block transfer size used by the GoPro HD Hero 3 Black Edition. Even as the Transcend card doesn't excel at real 6.6MByte/s, compared to the 16MByte/s as printed on the package, this performance still gives enough room for Protune performance requirements. And in contrast to SanDisk Ultras, the Transcend cards are comparable stable performers. The glitches that are visible should be covered for by the camera's internal buffering.
Now this looks promising for real HD Hero 3 Black Edition use.
|Transcend 32GB microSD, class 10 writing performance|
for 32KByte block size.
Well, as a compensation for the cards' better performance one of the SD card adapters was faulty. You can't get everything perfect in the same batch.
Coming back to the unsubstantiated claims topic from the beginning: of course, the marketing departments are on the safe side, thanks to their lawyers. Of course, there is some obscure benchmark they developed that churns out their impressive performance numbers. As if transfer block sizes of 512 kByte are realistic: the Transcend cards then reach whooping 14 MByte/s writing speed. Of course, dear reader, take all this with the necessary grain of salt and judge for yourself whether the claims made by these companies are true.