This is my 1st time buying a sandisk card but ive come across a problem im not sure is either card or reader
I purchased a new 64GB mobile ultra UHS1 class 10 from an online retailer and when it arrived I wanted to test it so used Crystaldiskmark and h2testw but unfortunately my old multi card reader was only showing read and writes no higher than 4MB/s, so due to the age of the reader I went and purchased a “sandisk mobilemate duo”.
Now heres where It gets tricky using the microsd reader and plugging it into my comp usb Im getting random problems of the card seemingly being disconnected from windows 7 when i try and use the tests and copy and paste files from windows to the card. I did manage to get 1 h2testw complete and everything was fine.
But if i use the sd card adapter and plug it in my old card reader its fine but just at low speed
so in a nut shell:-
old reader w/adapter is ok but low speed
USB micro adapter directly plugged into pc is giving disconnect problems.
Ive tried a transcend 16GB sdhc card in the usb micro adapter and no probs (weird)
So am i looking at a card with dodgy connections or the adapter faulty? whats your thoughts?