Imation hard drive not working on laptop and tvs

A friend has a Imation hard drive was all working well and fine until her brother put some movies on there and now it's not working. I have plugged it into my laptop and it's not recognised in My computer but does come up as a device in computer management device manager but not in disk management.
It worked fine before on my laptop, her computer and various tv's and media players.
Her brother has said that his has played up occasionally so what ever was stuffing his up has obviously passed onto hers.

I have windows 10 and a Asus laptop. My external hard drives work fine on my computer so it's not the usb ports and my cord doesn't make a difference on her hard drive.

If I have to wipe the hard drive it won't matter too much.

Ps. I am computer savvy but don't know all the techinical lingo haha
 
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