how to distinguish good hdd enclosure and bad hdd enclosure

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we professionlaly produces hdd enclosure ,now i introduces how to purchase hdd enclosure. first you should pay attenton to the port,usually used USB OR ieee1394 as port. second ,you should know consumption, usb can provide the largest electic current for 500mA so that it cannot satisfy 3.5 inch hdd enclosure.third the body material.the body material used in the hdd enclosure have plastic ,aluminium alloy ,aluminium and magnium .but plastics are bad to disperse heat