Originally Posted by doomed151
About that auto-unmount SD card when connected, you can work around it by using MTP mode. It's not a "problem", that's just the way it works.
Settings > Xperia™ > Connectivity > USB connection mode > MTP
I did several tests, but in fact, it doesn't correspond to that I'm searching for. I was searching more like "Always ask me".
I'm using a widget (widgetsoid) to plug/unplug the sdcard. But since ICS, a service
automatically plug the card when we plug the USB, and even I unplug the card with the widget, the service plug it again
Finally, I solved my problem by chosen the option MSC again, and freezed the services USB capability and Storage capability. Now, only my widget is activating/disactivating the USB