|Hard drives do not beep. There is nothing inside a hard drive to make it beep.|
The is probably nothing wrong with the hard drive and something else is making the beeping noise, possible the BIOS telling you there is a fault on the motherboard, possibly memory or video.
You need to explain in detail exactly what the happened and when and explain what you mean by dissembled. What was this external power and data, was it USB. Did you connect it to the same computer is was installed in originally.
message edited by StuartS