Can I transfer Music files from an ext HD to the internal SD card?

[WPCentral Question]

I have a Samsung USB ext. HD and I can plug it directly into the micro usb port of the 2520. I have inserted a 64gb Micro SD card. The file system software sees both devices, but I cannot copy and paste or move files back and forth. Suggestions?

 

[EStrait39]

I switched from iPhone to WP, and I used OneDrive to transfer my files over. The case for me however, was that I had a computer with all the songs installed. I logged into OneDrive on that computer, transferred all the songs over to OneDrive in a new folder I made (Music), then installed it onto my phone from OneDrive. I used a laptop, however, to get the songs on my phone, instead of downloading them from the cloud. Hope this helps you!