When Seagate’s Barracuda series 7200.11 was first released, the firmware had a bug that could render your drive inoperable. Any time the drive went to sleep or the computer was shut off, there was a chance that the drive would not get back to a “ready state” and properly accept commands. At that point there is no way to get to your data without specialized tools.
As data recovery experts we still get requests about these drives and to help recover the data. This means that if you have one of these Seagate drives, take the time to check that you have the latest firmware on them, so that you don’t get hit by a non-responsive drive. Unless of course you like having to hand your precious data over to a data recovery specialist to get access to your data back.