USB Dard drive doesn't show up after i failed to eject it

i turned off a usb external drive without ejecting it first and now it doesn't show up on the desktop,
when i run disk utility it just shows the gathering disk information but doesn't get past this unless i turn off the drive again. is there a way of fixing this as i've has it happen before and after a while the drive comes back after i leave it for a while.

for some reason it just came back on after i left it for 10 minutes.

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