I have a hard drive like this http://www.islabit.com/wp-content/imagenes/xbox360-hard-drive.jpg and I buy an Xbox 360 slim my question is if I can use this
hard drive in xbox slim
You might be able to get the drive into a 360 S if you use a sledgehammer. Neither the 360 S nor the HDD will be functional afterwards, though.
you cannot use the original 360 HDD with a 360 S.