Short answer – I would suggest that the OP check the IDE cable or the IDE connector on the drive for damaged pins or bad contacts.
To the moderator – if you delete the serial numbers, then a vital piece of information is lost.
It so happens that the difference between the serial number reported by software, and the serial number recorded on the drive, points to a fault in one particular bit of the IDE interface. Although the OP has given us the serial numbers of two different drives, ISTM that “GD-WCAE1#8!8#8” should in fact be “WD-WCAE138183x”. If so, then this points to a failure in either bit 4 or bit 12 of the IDE interface. This in turn points to a problem with pin 9 or pin 12.
Unfortunately, we cannot allow serial number to be posted, he can PM you the information, but we are required to delete any serial number posted in any threat…