Pinging or severe knocking sound from a hdisk means that it suffered a mechinical breakdown. This problem is very prevalent in the past 10mb to 40gb kind of hdisks. Recent years, this problem is getting lesser, so I guess they are making more reliable hdisks.
Unfortunately, most of this cases, you cannot retrieve data from it by normal means. (as long as you can't access it as a drive on your windows os) It's as good as gone, unless you want to spend into the thousands to get data forensic experts to do it (involve tearing the data platter out). Not all data can be recovered even by experts.
If under warranty, you can send it for repairs, but a blank hdisk will be returned to you. Most probably, it's not the same one you send in. They will accept your spoilt hdisk and certify that its spoilt and under warranty, and then dispatch another already repaired one back to you.
That's why last time when I was still actively repairing pcs, my advise when making service calls is always: "backup your important data, or no one can help you get it if your hdisk crash".
Unfortunately, most of this cases, you cannot retrieve data from it by normal means. (as long as you can't access it as a drive on your windows os) It's as good as gone, unless you want to spend into the thousands to get data forensic experts to do it (involve tearing the data platter out). Not all data can be recovered even by experts.
If under warranty, you can send it for repairs, but a blank hdisk will be returned to you. Most probably, it's not the same one you send in. They will accept your spoilt hdisk and certify that its spoilt and under warranty, and then dispatch another already repaired one back to you.
That's why last time when I was still actively repairing pcs, my advise when making service calls is always: "backup your important data, or no one can help you get it if your hdisk crash".