My computer's hard disk seagate 40 Gb is damaged but it will show in bios set up . how can i recover my data back plz tell me.

Hi,
HDD not Detecting only Some region, if you HDD data cable damage, HDD power Cable damage, HDD port damage, or HDD bad sector. But normally you change HDD data or power cable or mother board port. And i suggest mother board all connection disconnect and only HDD connect and open bios and search your HDD detected.

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You can purchase an "empty" disk-drive enclosure, and then "transplant" your current disk-drive into the new case. That should recover 100% of your data.

Take the old enclosure to the computer-store, so that they can sell you a "compatible" new enclosure.

Probably $20 to $40.

Seagate Barracuda 7200 fault:
Hello A.
Is the drive internal or external use?
Could be several reasons:
The head has crashed.
The driver is corrupt or missing.
The controller board on HDD has failed.
Data or power connector / cable loose.
Disk has overheated and failed.

Open the PC and check cables.
Check ventilation.
Is disk clicking or getting very hot?

If external, check connecting cables.

Download latest driver from Seagate.

If all else fails, take system to computer sales / service center.
They may be able to diagnose the fault for you.

The final option, but very costly, is professional data recovery.

if HDD detect's on bios then just formate your HDD it will start woking

Any computer shop can give you an estimate, but it can be fairly expensive, just depends what has to be done to access the disk platters, so make sure you get an estimate first in writing. Good luck!

You can use a utilities like partition recovery to try to recover the previous partition.

It's possible that your computer's motherboard is "old", and it only supports a maximum of 32GB per disk-drive.

Buy a new 80GB or 160GB disk-drive, and copy all your files from the "old" disk to the "new" disk.

Try connecting it to another computer. If you can see your data then back it up etc.
After you have recovered your data connect it to your computer, from Disk Manager, remove the partition, recreate it again and then format the drive, hopefully your external drive will be operational again.
There is a possibility that the hard disk has died and you will have lost your data. If you are desparate, hard drive data recovery companies charge an arm and a leg to recover data from dead drives.

After data is recovered, it should be moved to another drive to keep safe. The drive that was recovered has to be reformatted and checked for errors before storing more data.

If you cannot get the USB connection working, you can recover the data by taking the drive out of the case and connecting it directly to the PC as a second drive.  Make sure the jumper settings are correct for use as a second drive.  You can get the drive information and jumper settings from the web site of the drive manufacturer.