comprise a handle 350 for the user to easily pull out install the whole removable hard disk loading device 300 the 2 5 inch hard disk can be placed in the loading space 340 and because the size of the u shaped accessory 330 corresponds to a 3 5 inch space the u shaped accessory 330 can be embedded inside the hdd tray 310 which originally supported the 3 5 inch hard disk in addition because the loading space 340 of the u shaped accessory 330 corresponds to 2 5 inch hard disk the 2 5 inch hard disk can be placed inside the u shaped accessory 330 in other words the 2 5 inch hard disk can be placed inside the hdd tray 310 through utilizing the u shaped accessory 330 please note that the u shaped accessory 330 is a removable accessory and therefore if removed the hdd tray 310 can load the 3 5 inch hard disk however when the u shaped accessory 330 is installed in the hdd tray 310 the hdd tray 310 can support 2 5 inch hard disks that is the removable hard disk loading device 300 can support both 3 5 inch and 2 5 inch hard disks the embodiment.