Question: can hdd be used as external?
Answer: Yes, A Pc Harddisk can be used as a External Storage device. Generally in PC we get 3.5 Harddisk because they are fast .. ... Generally 3.5 Inch HDD Runs at 7200RPM which requires more power which a USB port cannot provide where as 2.5 Inch runs at 5200RPM which is less so it can run on USB port..