MicroSD card mounts read-only

[darkweasel]

Hello everyone,

I recently (for Christmas) got a new 2GB MicroSD card and an adapter for 
it to use it with my SD card slot - in order to be able to transfer 
music from my computer to my Nokia 5300.

However, no matter if I insert the new MicroSD card or the old 256MB one 
that came with my mobile phone, Ubuntu says it's read-only and doesn't 
let me transfer music to it. I already asked at the German support forum 
ubuntuusers.de but didn't receive an answer there.

Thanks in advance.