USB HDD only show up on one of Macs

[AppleHater]

I have a WD USB hard drive that I've using with my MBP. Now, I connect it to my new iMac and I'm having all kinds of issues. First, I had to authenticate every time when I try to write to it or modify anything.

I searched up internet to use sudo command to remove that authentication requirement. Instead, the drive stops showing up on the left panel of Finder, nor iMovie, nor Lightroom.

I can access it fine from the desk top using the desktop icon, but it's not accessible other ways. What should I do to fix this? This is my main data drive and it'll be a pain in the butt if I have to reformat this...

 

[IHelpId10t5]

I have a WD USB hard drive that I've using with my MBP. Now, I connect it to my new iMac and I'm having all kinds of issues. First, I had to authenticate every time when I try to write to it or modify anything.

I searched up internet to use sudo command to remove that authentication requirement. Instead, the drive stops showing up on the left panel of Finder, nor iMovie, nor Lightroom.

I can access it fine from the desk top using the desktop icon, but it's not accessible other ways. What should I do to fix this? This is my main data drive and it'll be a pain in the butt if I have to reformat this...

Right-click the drive's icon, choose "Get Info", click the lock in the lower right and authenticate yourself, then enable the "Ignore ownership on this volume" check box.

 

[AppleHater]

Right-click the drive's icon, choose "Get Info", click the lock in the lower right and authenticate yourself, then enable the "Ignore ownership on this volume" check box.

Problem is that that selection itself won't show up for this drive. Even on my MBP, that open is gone for the drive, although I have no other symptoms with it that have with the iMac.

 

[AppleHater]

To add more, I can unmount it from Path Finder, but I get an error if I try to unmount it from the terminal. It asked me to use diskunmount.

 

[Rodan52]

Have you tried repairing it in Disk Utility if it is visible?

 

[AppleHater]

Have you tried repairing it in Disk Utility if it is visible?

Thing is that verify or repair option doesn't even come up. If I choose it from the menu bar, the drive doesn't show up among choices.

 

[Partron22]

new iMac

So USB 3.
Have you tried moving the drive farther away from the Mac before startup?