|See the info at the link in response 2. Problems accessing data on an external drive are almost always caused by either |
- the drive not being able to get enough current from the USB port you have it plugged into,
- or - you have unplugged the drive without clicking on Safely Remove Hardware and choosing to STOP accessing it at least once.
Plug the external drive's USB connection into a port built into the laptop - you are likely to have problems if you plug it into a port in an external hub that plugs into a port built into the laptop - that type of external hub DOES NOT work with many things. With some laptops, you must plug the external drive into TWO USB ports on the laptop end - at least one of those should be one built into the laptop.
Of course, that's assuming the external drive hasn't been dropped, or been subjected to some other physical jolt..
2.5" drives in external enclosures are a lot more easily damaged from doing that than ones with 3.5" drives, and the external enclosure's circuits can be damaged from that with either type.
If you suspect the external enclosure has been damaged, you could try the drive in another external enclosure (new enclosures start at about $30 to $40) , or connect it some other way internally or externally to another computer.
The Windows version of Seagate's SeaTools can test any brand of hard drive when it's in an external enclosure, if the external enclosure's circuits are working properly.