online virtual drives

some e-mail providing services offers online drives like Gdrive even microsoft trying to get live drive G drive provides 2 gb for every gmail account, aol offers 5 gb as online x drive,some web services like netdrive, driveaway,i-drive offering 1-5 gb as virtual hard drives the problems with
they takes much time to copy files and even difficult to sign in when net is slow even yahoo offers a online service named brief-case which offers 25 mb for some files