External HD won't work and cannot repair or erase? please help!!

Hello, I brought a 1 TB WD external hard drive and formatted it to use with both my mac and windows. At first it was working perfectly but after around 1-2 weeks it suddenly stopped. Now it doesn't show up on a mac or windows. I can see it on my disk utility (mac) but when I try to repair it it says repair failed and when I tried to erase it to start again it said 'disk erase failed with the error: POSIX reports:the operation couldn't be completed input/output error' please say in just being an idiot and it can be resolved easily. Thank you in advance for any help given :)

only 2 possibilities, your HD is dead/ corrupt
OR you have a very common failure called a SATA bridge card failure.
read all about same here:
Your dead external hard drive is likely fine! Great hope for your 'faulty' external HD
sounds like you have SATA card failure , read above link

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"I work for HP."
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