Mac Mini does not recognize external hard drive

Hello!

I have a weird question on my Mac Mini. I have two Seagate to 8 external drives connected via USB to my Mac Mini (mid-2011 with Maverics). The discs worked well, but suddenly one of them will not be recognized by the Mac Mini.

I connected the hard drive of my MacBook Pro and an old PC and it works fine and all files are available, but for some reason, my Mac Mini will have nothing to do with her anymore.

It does not appear in the finder or disk utility. I unplugged the hard drive for hours and then tried to plug it back without a bit of luck. I restarted the Mac Mini on several occasions. I also tried to connect it to all the USB ports on the Mac Mini. When I connect it to the USB ports, there is no whisper sound indicating that it has started working. However, no sign of it on the Mac Mini.

It's like the Mac Mini has decided to ignore the external hard drive, no matter what I do. Seeing this works on other devices, I'm fairly certain that the problem lies in the Mac Mini.

I'm no expert, so any help will be very valuable for me. And if you are kind to help, please explain it to me like I'm 8 or 93 years old.

Thank you.

Are these drives powered independently or they depend on USB power?

Tags: Mac

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