i think this is the same topic as this problem
https://www.istorya.net/forums/comput...ternal-hd.html
as again would advice to do this to make sure your harddisk is ok
"i experience this problem,
sad to say, but your enclosure is fried or the connector...
here what you do open the enclosure,
get the harddisk out, if its sata, used a sata cable and connect it inside your pc, if ide do the same,
just do as if the harddisk is for internal, thats what i did at luckly the harddisk is fine."