http://www.amazon.com/Lexar-High-Pe...p/B00O1M21H8/ref=cm_cr_pr_product_top?ie=UTF8
It is supposed to have write speeds on the order of 40MB/s, but under no circumstance am I getting much more than about 20MB/s - whether in transferring real files or in benchmarks, using the card reader or the usb3 port with the included adapter. Read speeds are good at 60-90MB/s and it's not counterfeit - I've nearly filled the thing and used it heavily for the last few weeks.
Some other reviewers are reporting the same write speeds, while others are showing speeds of 30-40MB/s.
Any thoughts? What write speeds are people getting from other cards?
Surface Pro 2 Micro Sd Slot
Inserted the card and loaded my files with no issue. Tried pulling out the mini SD Card adapter and it’s getting stuck. I’m afraid to pull it too hard in cas. Can someone check to see if the SP4's microSD slot is UHS-II? Posted by 5 years ago. But a Surface Pro 4 Data Sheet from Microsoft stated that the MicroSD reader is UHS-I. In contrast, the Surface Book SD reader is rated at UHS-II. BTW, I originally found the SP data sheet from a link posted on Reddit showing the SB data sheet. I just tried with a 32GB micro-SD card, first I formatted the card via a USB adapter on the SP4 as NTFS, then I installed the card on the micro-SD slot all the way in, you can feel it because there is a click, but nothing, no card on Device Manager neither Disk Management tool, after 3 cards successfully tested over the SP4 using a USB 3.