Hi there Mohammed Ibrahim,
Is the drive external or internal one? In both cases, the troubleshooting steps are almost identical.
Does the drive even power up? In case it doesn't, you need to connect it with a different USB(SATA and power cables if internal) cable to a different port. Trying different cable/s is a good idea even if the drive seems to be powering up just fine.
Is the drive recognized by Disk Management and how?
- In case the drive is not recognized by Disk Management, and you've tried changing cables/ports, then it most probably dead.
- In case the drive appears under Disk Management but has damaged partitions(unallocated) or file system, you may need to use some kind of data/partition recovery software in order to retrieve the data.
After you recover your data, it may be a good idea to test the drive with some HDD testing tool:
http/www.tomshardware.co.uk/forum/282651-32-best-diagnostic-testing-utility
Cheers,
D_Know_WD