The partition table may have crashed failed. Generally is unlikely you have lost the lot. you may just need to run data recovery software over the Seagate drive.
Suggest you install
http://www.easeus.com/datarecoverywi...y-software.htm Aim it at the USB drive. the free one will handle 2GB But will show if its recoverable.
Use the Deep Scan.
Expect it to take a while though, started one yesterday, was scanning a deleted partition, just under 1 TB ---- 27 hours later - recovered.
As long as the drive can be seen you may have to look for this: ( of course it will be called something different & be the full size of the drive)
Attachment 7472
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