Here is Seagate's response.
Welcome, Seagate hard drive owners. A number of Seagate hard drives from the following families may fail when the host system is powered on:
Barracuda 7200.11
DiamondMax 22
Barracuda ES.2 SATA
SV35
Once a drive has failed, the data is inaccessible to users. Seagate has isolated this issue to a firmware bug affecting drives from these families manufactured through December 2008. Please use the following tools and instructions to determine if you have one of the affected products. If you do, we recommend that you update the firmware on the disk drive.
To help determine if you need to pursue this any further, you will need to check your model number, serial number and firmware revision. This can be done in Windows – it's easy! Download and run, or simply run as is, the Seagate Drive Detect software program. You will see a screen like this. Look for the drives that are Attached:

In this example above the model number name is ST31500341AS, the serial number 9VS00J20 and firmware revision SD1A.
Click here to download Drive Detect: 
Or you can use Microsoft Windows Device Manager to see the model numbers of you disk drive. At the Windows Start button select Run and type: devmgmt.msc
Then expand the Disk Drive branch to see the model numbers. Like this:

Or you can download SeaTools for Windows which displays all of the needed information.
See if your model number is in this list.
Barracuda 7200.11 ST31000340AS ST31000640AS ST3750330AS ST3750630AS ST3640330AS ST3640630AS ST3500320AS ST3500620AS ST3500820AS ST31500341AS ST31000333AS ST3640323AS ST3640623AS ST3320613AS ST3320813AS ST3160813AS | Barracuda ES.2 SATA ST31000340NS ST3750330NS ST3500320NS ST3250310NS | DiamondMax 22 STM31000340AS STM31000640AS STM3750330AS STM3750630AS STM3500320AS STM3500620AS STM3500820AS STM31000334AS STM3320614AS STM3160813AS |
If you have one of the models listed above, Customers can expedite assistance by contacting Seagate via email. Please include the following disk drive information: model number, serial number and current firmware revision. We will respond, promptly, to your email request with appropriate instructions.
Or you can call Seagate Support at 1-800-SEAGATE. Please be prepared to give the serial number of your drive as the solution depends on knowing the exact serial number.
For a list of international telephone numbers to Seagate Support and alternative methods of contact, please access http://www.seagate.com/www/en-us/about/contact_us/
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