This sounds most likely like there is media/platter damage occurring if you feel the motor turning. Nothing you can fix on your own, you need a professional with a clean room to examine the issue.
Switch off and on your Freeagent, that should cause a driver to be loaded. If no change reset your Laptop. You should also upgrade to Windows 10, since WINDOWS 7 IS NO LONGER SUPPORTED.
Most likely there is a serious issue with your drive. The USB bridge is likely still communicating with your computer, thus why you see the device under USB media, however, it appears not to be receiving any information from the drive itself and that is why it is not showing under device manager. Would highly recommend to send to a data recovery service provider if the data is critical. There is a small chance that if you remove the internal drive from your enclosure and remove the USB bridge, connect the drive directly via SATA, it may be accessible. This will void any warranty you may have left on the device. Good luck.
Try plugging the internal drive in directly to a SATA connector, no USB. If the drive PCB is the original, and the drive is spinning, and still does not identify or accessible, then likely cause is not the PCB. If you want the data from this, consult a data recovery service that has cleanroom facilities.
You have an issue. The part number you gave is for a 12V power supply for an external hard drive. Since a typical USB puts out 5V, it cannot possibly drive your hard drive. There is a possibly..albeit low...where you can get a plug that plugs into 2 USB ports and provide 10V but I am not sure that will be enough to drive it. If this external unit is already in a case, look for a plug that would accept the power supply pin (pix attached)
Semper Fi,
Z
The connection will be the same (desktop or laptop, USB 2.0/3.0). Find an free USB Type A port on your computer. Connect the appropriate end of the USB cable to the Seagate hard drive and the other end to the computer's USB port. If you do not have any free USB ports, then you will need to get a USB hub or add a USB card to the desktop. You may need a powered USB 2.0 hub to ensure that the external drive works properly. (Warning: not all hubs are sold with the power adapter. Hard drives that loose power are often at risk of losing data.)
I hope this helps.
Cindy Wells
Only some are missing? If you can access the drive and see or download some of the files, it probably means the other files are not there. I have found it is easy to move files when transferring from one device to the other, when I meant to copy them. Perhaps this is what happened. If the drive was bad, or some other mechanical issue, I doubt you would be able to access any files.
It seem the folder is corrupted. I assumed you are using Mac, so you may try to repair disk using "Disk Utility". Since I don't know what version of Mac that you use, I don't know what to tell. You may try this link:
Use Disk Utility to Repair Hard Drives and Disk Permissions for your reference. Or, just google how to use Disk Utility. Good luck.
This is a hardware problem but since you can't access to the removable you have to order a new one making sure the warranty of your product is still valid
Semper Fi,
Z
