Harddrive won't mount anymore

Hello all,
One of my internal hard disks (Seagate Baracude 7200.11, 1 TB) of my Mac Pro won't mount anymore. The disk is spinning as normal, I don't hear a weird sound or anything. It just won't mount. Not in Finder, not in Disk Utility and not in Systemprofile.
I did try diskwarrior and some other utility apps, but nothing seems to work.
Is the disk just 'dead'? Or is there something wrong with the SATA connection?
Thanks for helping me!
Greetz,
Maarten

Thank you for the answers. I went to the Seagate website and did a firmware upgrade for the same hard drive that is (still) working...
The other one is 'dead' but, according to Seagate, the files are still on the disk. I contacted them to help me out. There are people that claim that Seagate will recover for free because it's a firmware problem.
Thankx!
Maarten

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