Having trouble with external HD showing up...

Anyone...HELP.
I have an external hard drive I use on my MacBook (I've used it for over a year and its fine). However, whenever the external HD is unplugged (usually by accident) I am not able to have it show up again.
I've turned everything off and back on again. Usually I turn the ex-hd off first, turn off comp, unplug & replug ex-hd USB, turn comp on, & turn ex-hd on (in that order) and still nothing shows up.
Has anyone had this problem? Does the order of which I turn on and off the ex-hd effect anything? I didn't think it did matter but obviously I am doing something wrong.
Help please.

"external HD is unplugged (usually by accident) I am not able to have it show up again. " > you must counter mesure this problem because it is not good for firewire or usb for that matter.
"I've turned everything off and back on again." Bad implementation just creates more of a problem.
"Usually I turn the ex-hd off first," You MUST unmount the firewire drive or usb first (Always). Then turn turn off the external firewire/usb power and wait a few seconds.
"turn off comp, unplug & replug ex-hd USB" Once unmount occurs then power down then disconnect cable Always from Mac first then the device whether it be firewire or usb.
Now how to reset all? Disconnect all cables from Mac and device. Remove battery from Macbook. Press and hold power button for 5 seconds. restart Mac book. Power on device. Connect cable to Mac first then to device.

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