My iMac won't recognize an external hard drive, but 3 other macs will.
I just bought a 3TB Toshiba external hard drive, and when formatting for mac it on my iMac it was getting an error when I named the drive in Disk Utility. I brought the drive to work and formatted it there (leaving it as untitled allowed it to be formatted).
After working on it all day when I brought it home to my iMac it was no longer showing up in Disk Utility. The light turns on and it sounds to be working. I plugged it into my laptop and it shows up right away.
I believe I might have done something to mess it up just on my personal computer that isn't recognizing it anymore. I hope this makes sense.
Is this a good question?