I purchased this Samsung Micro-SDXC card (90MB read / up to 80MB write) for my 1520
Amazon.com: Samsung Electronics 64GB PRO Micro SDXC with Adapter Upto 90MB/s Class 10 Memory Card (MB-MG64DA/AM): Computers & Accessories
But, I noticed that file transfer from either PC to Phone or Phone to PC is very slow which took more than half hour to transfer 4 gigabyte pictures and videos. However, when I record the video with 1080P/30F, I didn't see any lag. I had another Windows phone 7.8 device before and that only took few minutes to transfer 4GB data.
How is your transfer speed?
Amazon.com: Samsung Electronics 64GB PRO Micro SDXC with Adapter Upto 90MB/s Class 10 Memory Card (MB-MG64DA/AM): Computers & Accessories
But, I noticed that file transfer from either PC to Phone or Phone to PC is very slow which took more than half hour to transfer 4 gigabyte pictures and videos. However, when I record the video with 1080P/30F, I didn't see any lag. I had another Windows phone 7.8 device before and that only took few minutes to transfer 4GB data.
How is your transfer speed?