Satellite L670-1JP external HDD not always recognized on start-up

I bought a Samsung G3 external HD. The first time i plugged it in, it was directly recognized by my Toshiba Satellite L670-1JP and worked with no problems.
But later, almost everytime I start up my computer, he does not find the external HD. I then have to unplug en replug the USB connection several times to make it work.
This is rather time consuming, so how can I solve this problem ?

Hi
Do other USB devices work properly in connection with the Satellite L notebook?
Did you test this external HDD with other computers/notebooks?
I think you should do this because it could be a external HDD malfunction.
Check this!

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