Seagate drive not mounting or showing up in disk utility

I have a Seagate Barracuda 7200.10 500 Gbytes that I took out of its external casing because it was not mounting.
i assumed the sata to usb converter in the case was bad.
I took it out and put it in one of the drive bays on my MacPro 3,1 2008 and started my computer up.
my computer was beeping about once a second while it was in apple's version of a bios boot.
when i start it up the disk does not show up in finder so i go to the disk utility and the disk does not show up their either.
so i open my computer and touch the outside of the drive and its spinning just fine, it doesn't feel shaky or sound bad.
Any ideas to get my drive working?

I've pulled three Seagate Barracuda HD's from their external cases (GoFlex) for use either in drive bays or better external enclosures and all worked. However, there's a hidden Master Boot Record (MBR) in the first partition even when the GoFlex has been formatted for use attached to a Mac and the entire drive has to be reformatted with a GUID partition table for it to be usable.
In Disk Utility, is there even a Media line for the Seagate? If so, that's what needs to be partitioned. If not, do you have the Debug Menu enabled in DU? If not, enable it and see if that helps.
I had pulled the Barracudas out of their enclosures because there was no ventilation and they were overheating (Tech Support denied that but the SMART record showed they were). It's possible that yours was cooking for so long that it is now indeed fried, which would explain why it didn't work in its original enclosure any more either.

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http://www.prosofteng.com/products/data_rescue.php
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Hello, Please help me if you can:
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Hi, Brian, and welcome to the Discussions!
You might perhaps launch System Profiler (from Applications/Utilities) and see if the device is listed there under the FireWire heading in Hardware Overview.
Can you hear the LaCie spin up when powered on?
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You can test the FireWire port with another Firewire device, or by hooking up to another Mac via a FW cable and trying to boot into FW Target Disk Mode. Visibly check the port at the Mac end first to insure that there are no bent pins at the connector (so you won't damage another device).
You can try resetting a "dead" FireWire port by shutting down, unplugging the external FireWire devices, and disconnecting the Mac's power cord for thirty minutes or so. Before doing this, run Disk Utility's Repair Permissions process on the startup volume first, to see if that corrects it.
Gary
1GHz DP G4 Quicksilver 2002, 400MHz B&W rev.2 G3, Mac SE30 Mac OS X (10.4.5) 5G iPod, Epson 2200 & R300 & LW Select 360 Printers, Epson 3200 Scanner

External hard drive not mounting - what's happening?

All of a sudden one of my external firewire drives is not mounting, but that's not all....
it's not showing up in disk utility, not showing up in system profiler, not showing up on desktop, not showing up in finder, not showing up in Disk Warrior, and not showing up in TechTool.
When I turn on the power, it seems to spin up but doesn't mount. No usual noises either.
Could it be a faulty controller board on the enclosure?
Any suggestions?
Really hope to figure this out, cause it has my entire itunes collection (500gb) on it.
Thanks in advance.

gr8fl4295 wrote:
All of a sudden one of my external firewire drives is not mounting, but that's not all....
it's not showing up in disk utility, not showing up in system profiler, not showing up on desktop, not showing up in finder, not showing up in Disk Warrior, and not showing up in TechTool.
When I turn on the power, it seems to spin up but doesn't mount. No usual noises either.
Could it be a faulty controller board on the enclosure?
Any suggestions?
Really hope to figure this out, cause it has my entire itunes collection (500gb) on it.
Thanks in advance.
First, try another FW drive or device in your computer to be sure that FW is working.
If you have more than one FW port, try the drive in it.
Change FW cable.
Try the external HD on another Mac (do not use a PC!!!)
If none of above works, it's most likely the logic card in the enclosure, and not the external HD. I believe your data are OK.

Hi, I have a freecom 1TB hard drive which was working fine until it froze. I pulled it out (mistake I now know) and now it doesn't mount. It shows up in Disk Utility but won't manually mount. When I try to repair it gives message 'failed on exit'. hel

Hi, I have a freecom 1TB hard drive which was working fine until it froze. I pulled it out (mistake I now know) and now it doesn't mount. It shows up in Disk Utility but won't manually mount. When I try to repair it gives message 'failed on exit'. Some people have said to try Disk Warrior, but at $100 it's quite expensive maybe fix. help!

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http://www.prosofteng.com/
http://www.wondershare.net/ad/data-recovery-mac.html?gclid=CLTp3Mj07rkCFevm7AodL lUAHw
http://diskdoctors.com/software/mac-data-recovery/utility.asp?gclid=CMyf_MH17rkC Fcvm7AodSE0A8A
http://www.cleverfiles.com/

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I've had exactly the same trouble this morning.
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