My laptop suddenly will not recognise the seagate device,

Assuming you have tried other usb ports and had no change,remove the usb connection, then go back into device manager and select the usb controller, right click and select delete as this will erase any input driver the usb port recognises. Restart the pc and then the controller should be reinstalled automatically as it sounds as though the controller has become corrupt for some reason. Go back into device manager and check there are no exclamation marks, reconnect the drive and see if it's recognised.

It may be that you need a driver for that particular external hard drive.

Visit: http://www.seagate.com/www/en-us/ and search for your specific model and see if a driver for 64-bit Windows 7 is available.

Update your devicemanager

Try with another PC, If still not recognising, then You have to open the Casing of your external drive. If you have any Warrenty remaining for this Drive, then let company people fix this. if no warrenty then Remove the HDD from the casing, Connect HDD to the PC with another External casing, and backup your Data. If no ditection with this method, then your HDD is Dead. Keep finger crossed best of luck

it ok its mean you must turn on your computer than your hard will work.its the law of computer for every hard disk..

Try to plug it in to another PC to see if you get the same message. See if you can run a scan disk on it from Windows to see if it's bad or going bad too.

To be honest, device not recognised is a bad sign. :(

USB drives do pack it in. You have answered your own question, I think. Three computers cannot recognize it, must be the drive.
A fall can happen and not leave a mark. A fall to the floor is like a bomb going off for a hard drive. It sounds as if the motor is jammed.

hi..the reason for your problem is your extenal
hard drive has been affected by viruses.The best
solution to this problem is scanning your hard drive.
once you scan it u will be free of viruses and your
laptop will be able to recognise your hard drive.
try it out..
thank u..
rate me..

TRY THAT EXTERNAL DRIVE IN OTHER PC AND CHECK IF IT IS RECOGNISED THERE, BECAUSE IF IT IS NOT RECOGNISED THERE ALSO THEN LIKELY YOUR CASING IDE CONNECTOR *** CONVERTER HOUSING HAS PACKED UP.