@ Realbest : Thanks for the reply. I have some crucial data on the HDD and would prefer recovering the files prior to formatting.The HDD is a Hitachi make.
@dextermat : I will surely try that. Thanks for the replpy
More to add to my problem, when the ext HDD connected, the disk management shows up "connecting to virtual disk service" and does not proceed. And whenever the HDD is plugged in and I launch any recovery software, it stalls. The recovery application window appears only after I removed the USB cable of HDD.