Re: Any way to create SD ext partition from phone without SD form
You need to do it with Linux, and give it a ext4 partition. I'd have to analyze my partition in Linux to find out which type it exactly is, but I don't feel like bothering. It's really easy to do though. You can use a graphical tool if you want, gparted.
In reply to A-android-B, you can get around a PC reformatting, by either resizing the other operating systems partition, installing Ubuntu in Windows (via WUBI), or you can use a Live CD (no installation needed at all!).
I wouldn't trust Windows with creating an ext partition. That's Linux level stuff, only Linux should be trusted with it.