External Storage (hdd) is not detected after loading Mac OS X v10.7 Lion

Dear All
Everything was o'k with 10.6, but in 10.7 - it does not react at all. It is Seagate 500Gb. After connecting leds lit, but nothing more happens.
Thanks in advance for your kind advices.

i have the same problem. it seems that Lion uses different filing system and doesn't recognizes the HDD. Try if you can see it in the Disc Utility.( i can)...However, not even Repair does anything.
I found this help at the forum. It seemed to work for some people, but not for me. I cannot find the mentioned file.
so i am waiting for Apple's patch or update.
let me know if it worked for you.
here's the advice from the forum:
1. I uninstalled every NTFS driver that I had on my Mac.
2. I restarted.
3. I deleted the file on this route:  /System/Library/filesystems/ufsd.fs
(I did a backup of the file, just in case)
4. I reinstalled a NTFS driver, (I used Paragon NTFS for Mac v.9.0)
5. Restart again.
6. You're done. You should be able to mount your external NTFS drive.
Big thanks to Nic Pel and Humbertog for their help
Here's the thread if you want to read it https://discussions.apple.com/thread/3191198?start=0&tstart=0

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