"whirling and clicking sound repetitively" is a bad sign that the drive has failed, and as someone who has had several hard drives fail on me over the past 18 years, I'm all too familiar with those sounds. Opening the actual hard drive which sits inside the enclosure will prove to be fruitless for a failed hard drive that's making those kind of noises. Damage has occurred (as proved by the noises it's making), you can't fix that.