Hi dear is not properly working . and hdd is ok

This means that the external enclosure is broken BUT NOT THE HARD DRIVE. If you have a warrenty with this unit, they will replace it but not extract your data from it without a fee.

If you need your data out and hopefully you have no warrenty on this unit, you crack open the housing, gently extract the harddrive and buy another enclosure for it and it should work from there. If it does not get detected by your pc, its 2 things: either the usb port on your pc is not working any more or you have had a bad harddrive and needs replacing anyway.

The data on this unit in a dead or defective hard drive still can be extracted, however, you can either send it to a data recovery service or learn how to open the hard drive and extract the disk from it by hand to get your data out on your own: Your choice. Good luck