Macbook Air 2013 Doesn't recognise Toshiba Ext. Hard drive... Tips?

Hi all,
It's been a while since I last posted, but this one's got me tearing my hair out.
My MBA 2013 doesnt seem to acknowledge the existence of my external hard drive, which I'd quite like to load some home movies onto. I plug it in, and it lights up, as usual... But the mac doesnt give me any option to open it. I've checked through Disk Utility, and it doesnt show up there either...
Any ideas?
Thanks in advance, guys and gals,
Imran

Confirm you've looked for it in Disk Utility and via Go Computer in the Finder?
If so, and it is not appearing, is it USB powered? It might not be getting enough power through the USB port.

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