I have a Seagate External 3.5" HDD. The computer didn't recognize it a few days back. So I disassembled the enclosure & taken the 3.5" Harddisk separately & connected to the Motherboard directly using SATA cable. It worked well for some days.

Now again the Harddisk is not detecting at all. It shows up in BIOS while booting, but after entering Windows OS, it disappears. It doesn't show up on the Disk Management also and the Device Manager.

How to retrieve my data from the HD ? Please advice. All my data lies on the at HD. Please help

Hi, your drive failed with the enclosure and you got it running again outside the box...and you didn't backup first thing?!?
What model is it on your Seagate? You might be lucky to have a "simple" firmware problem.

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Yes, first time it stop responding you should have backed it up.

You have to make an image of your drive and then recover data from that image.

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You already have 2 good advices here, but I will just add that if drive detects in bios with CORRECT INFORMATION (model, capacity, sn) then clone drive using some NON windows utility like ddrescue and hope for the best. If it doesnt detect on BIOS, then if youre lucky, as Bosse said, it could be some bsy bug problem which can be fixed.

I assume, lesson learned, BACKUP.

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Thanks for your reply. I thought normally a HD connected to the MB directly won't fail that much. That's the reason why I didn't took a Backup. My Mistake

Firmwire update ? How to do that ? Seagate Freeagent 500GB Model.