My IBM hard Disk Stopped working!!! S.O.S?

Dear Sir,

I have a nightmare an hour ago my hard disk that I connect it with USB devise stopped working, and my computer didn't recognize it and so the laptop. The Hard Disk is IBM Travel Star model IC25t060ATCS05-0, I lost 45 gb of my data. And they actually very expensive because they are raw design materials. Idon't how to fix or what is the problem. I didn't drop it or shake it att all. Does heat cause this damage? because when I connect it I hear its sound and the usb gives me green, but the computer doesn't see it, and I can't open remove my hardware safely. Can you help?

I am waiting for your answer,

Sincerely,

Kareem
kareem_hamdan2003@hotmail.com
00972-599-751534