My Samsung hard drive wont work.?

My ps4 has run out of storage space so I ordered a 1 tb m3 portable external hard drive with a USB 3.0 cable. I connected it to my ps4 but it doesn't seem to be acknowledging the hard drive, I'm not a tech boffin so I don't know what I'm supposed to do or if I'm doing something wrong. Any advice... show more My ps4 has run out of storage space so I ordered a 1 tb m3 portable external hard drive with a USB 3.0 cable. I connected it to my ps4 but it doesn't seem to be acknowledging the hard drive, I'm not a tech boffin so I don't know what I'm supposed to do or if I'm doing something wrong. Any advice would be greatly appreciated.

BTW sorry if this was too long
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