I bought a seagate portale hard drive plugged it into my laptop, gave it a name, but cant see it on my computer noy even in device manager. But if i take portable hard drive and plug into another computer i can see it, what could I have pesed when I was plug hard drive to laptop ?
The laptop may not be able to supply sufficient power via the usb cable to the drive. Some usb drives have 2 usb connections to get extra power from laptops.
If you have any other usb devices plugged in to the laptop, disconnect those and try again, as well as trying different ports.