while i was trying to insert my drive in the drive bay the small aluminium foil(silver coating) on side of hardisk came of a bit...now i can see a small hole.
Does this mean my HDD will not be working anymore?

Dust is entering the HDA if not already sucked up if it was powered on. The risk is a unpredictable but possible head crash and data loss.

Not free solution but still cheap at the moment : contact someone who has cleanroom gear, they have to open the HDA, decontaminate, check media and heads and then clone with an HW imager on another disk. Safer and effective.

And cover the aluminu m hole.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

so i will need to buy a new hard disk?

I'm afraid YES.

You will have to buy another drive for use ,as this drive will be unreliable and will fail soon(if it has not failed yet).
If you have no valuable data in it, just trash it.
If you have important data , then you will have to take pro help.

@kimon, hard drives have a pillow shaped recirculation filter to capture airborne contaminants.

Here are two examples:
http://www.petervis.com/gallery/hard/Ha ... Filter.jpg
http://www.southbit.co.za/wp-content/up ... ilter1.jpg

If by some remote chance any particles have entered the hole in the casting, the drive's air turbulence will most likely sweep these contaminants into the filter. That's how it's supposed to work, anyway. I've heard stories from people who have opened their drives outside a cleanroom, powered them up, put the cover back on, and then continued to use them for years afterwards. I'm not saying to trust your drive completely, but if you perform a full format or zero-fill and then scan your drive without error, I would rest easier.

This article shows you the internals of a modern HDD:
http://hddscan.com/doc/HDD_from_inside.html

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A backup a day keeps DR away.

If by some POSSIBLE chance the whole thing doesn't work, drive / data is screwed.
This was not said enough.

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well i tried connecting the HDD to my pc but the pc doesnt even detect my hard drive,even though i can hear it spinning
so i guess its not working at all anymore
should i try and open it on my own?

Why not? You can get a couple of great magnets for your troubles- but dont expect anything else out of it.

Rewind ....



So, maybe the pillow shaped thing was on strike and the turbulence was not enough, maybe, so now the drive can rest in peace....

Bad idea to turn it on !

See how-modded-hdd-ghetto-and-funny-data-rec-t22769.html

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A backup a day keeps DR away.

Haahah! Yeh I remember that posting, fun stuff indeed.

An update on clear disk with window made from fast food container - the disk is still operational and seeing about 10 hours a month as a demo visual aid.

I conducted a surface scan not too long ago, passed with flying colors.

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On a clear disk you can seek forever.

I notice you took care not to disturb the aluminium foil. ;-)

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A backup a day keeps DR away.

Absolutely yes! People have no concept of how important this piece is. The stickiness of the adhesive picks up dust that the pillow doesn't catch. If it's one thing I treat with care and respect it's the foil sticker.

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On a clear disk you can seek forever.