[ALUG] Cant Format SD card.

Hi I have an SD card in my EeePC and it is auto mounted at boot. I am trying to format it but it wont let me unmount it using the format or disk utilty. I configured it using Storage Device Manager which is a front end for fstab. Options set are: defaults,uid=1000,umask=0 It is a FAT32 formatted SD card. I am having problems with DropBox and one of the suggestions is to format it to ext3 or ext4. I can unmount it in Storage Device Manager, but then I cant format it. Any ideas? Simon -- --- Twitter: http://twitter.com/SimonRoyal - LowEndMac: http://tinyurl.com/macspectrum - Skype: Simon-Royal. --- Asus EeePC 701SD running Ubuntu 10.10. Apple PowerBook G3 'Pismo' running OSX 10.4. Sony Ericsson Xperia X10 Mini Pro running 2.1