Maxtor is connected via USB cable, before trying the following methods, you can try to reconnect the external drive through another USB cable and port to see if it is caused by wrong cable or poor connection. Bad sector on the external drive How to fix “Maxtor external drive not working”?.The drive becomes a raw drive or does not have a recognized file system.USB port not working under-saving mode.Connect with wrong cable, or poor contact.Here are some causes of this kind of problem you can find a method from this post according to these causes. You may have met a problem the users mentioned in different forums, like “Maxtor external drive not working”, “Maxtor USB/hard drive can’t be detected by computer” and “USB flash drive not showing up. Hi, I have an external Maxtor 500 GB HDD is not working any more, I tried to reconnect it to different wires without any luck.