hello my console with internal memory 4GB only some games need to install content in internal hdd like cod ghost,watch dog,gta v,.... are there a method to put this on external usb hdd
You can configure up to 32gb of an external USB drive for use on the Xbox 360, see: How to configure a USB memory stick to be used as Xbox 360 storage
Yes, but you can only use 32gb of the external 500gb drive so not an ideal solution. The best long term solution is to get an external hard drive.