I thought I would give the SanDisk Extreme 128 GB microSDXC Memory Card a chance because it’s from their “extreme” range and I hadn’t tried the sd cards so I thought the benefit of the doubt. right from the packet, it made windows crash – not sure why but after restarting, I put it in saying error and let windows repair it. started copying my music, it was lightning fast – around the 60-70 mbs mark and about 1/3 way through 0! wouldn’t respond and crashed windows. so, the same process… FULL format and it worked ok but I had moved it to USB 2.0 just to be sure – I simply wanted to copy the files and didn’t really care about the speed.
Put simply, I think I am done with SanDisk now – I won’t bother returning this now as I have my music on my phone and will leave it at that. But if you want a micro sd card for regular use or anything memory/flash related I REALLY advise you NOT to buy SanDisk products as they ALL (i have had 4 SanDisk flash-based drives) and they all exhibit the same behaviour.
if you want very casual use and don’t mind the occasional faffing around with formatting and stuff, then I suppose for the money they are OK.
also, I have attached the benchmark – no 160Mb ANYWHERE – even on the sequential read which is the fastest so I would go so far as to say it’s a lie – same for the 90Mb claim. stopped running the test after the sequential as it was known what was to follow with others.
Overall, the SanDisk Extreme 128 GB microSDXC Memory Card is great when it works.