I have just bought a macbook pro and i want to use an ext hard drive with it which i previously used on a windows computer, but when i plug it in it doesn't show up on my macbook pro, I've wiped it and just need to format it but don't know how, help

i have just bought a macbook pro and i want to use an ext hard drive with it which i previously used on a windows computer, but when i plug it in it doesn't show up on my macbook pro, I've wiped it and just need to format it but don't know how, any help would be much appreciated

Try the other USB port. If it still doesn't show up in Disk Utility then there may be something wrong with your Mac. Try something else in each USB port and see if it is seen. If the other thing, like a USB thumb drive, does show up in disk utiltiy then the USB ports are fine.
Power down the system and restart with the drive connected, go to DU and see it it is seen.

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