There was a firmware bug a few years ago with Seagate 7200.11 drives. It typically affected 500GB drives and the symptoms were that the drive span, by could not be detected by the BIOS. It only affects a certain firmware, and is generally known as 'bricking' the drive.
Fortunately CnW Recovery do have a fix for this problem, and has had a high success rate, with complete data recovery. Contact CnW for more details if you think your drive has been affected.
The above problem is not be confused with another common Seagate failure of bearing seizure. The disks spin at 7200 rpm (ie fast) and sometimes the bearing sieze. The solution is a skilled replacement of the platters into a different drive case, only to be undertaken in a clean room with qualified operators. A drive has several platters and the radial alignment between the platters has zero tolerance. ie if the platter moves a micro degree out, all the data will be lost. CnW does not have a solution for this problem, but can recommend companies who can help.
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