what is and sdcard ext?
It is the removeable microsd card in your phone. When you connect your phone to a pc via usb in mass storage mode you should see two new device letters. One is 'MOT' representing the internal accessible memory and the other is the microsd card. You can drag and drop files, such as music, pictures, videos, documents, etc. to the microsd card to use on your phone. The card can be removed from the phone and used in a card reader for transfers also. In addition, there are ways to wirelessly exchange files (Zumocast) and Google Music for music in particular.
Yeah Google Music ia great for transferring playlist.
Tapin & Talking roaming the forums on my Bionic
Running With the Magic Rom................... JBSourcery 4.1,.. JellyBean
Galaxy Nexus..... 4.2.1.. Jelly Bean
I just use zumocast and audiogalaxy as a backup. I would use google music but it doesn't hold enough. I don't know if it's a storage cap it has or a song cap but it's definitely missing about half of my library so I stopped using it. Zumo and Audiogalaxy work very well for me.