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- Cannot partition external hard drive mac sierra install#
- Cannot partition external hard drive mac sierra update#
- Cannot partition external hard drive mac sierra pro#
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The method described here actually creates a fully functioning macOS Sierra installation on an external USB device.
Cannot partition external hard drive mac sierra install#
Keep in mind, this is not the same as using an external device to install macOS, which lets you install macOS from an external USB device. I am also not willing to install High Sierra until the initial installation problems, boot failures and other crucial operational failures of this latest release have been corrected.Ever wish you could take your Mac with you on an external drive? You can actually install macOS Sierra on an external drive, flash drive, or SD card, then use that device as your macOS system disk wherever you go. I am convinced that Sierra is the problem, but I will entertain other ideas. Is there an app that will allow me to run a proper disc repair, or a terminal command I can run to do this? Moving back and forth between machines, thumb drives and Safe Mode bootups is getting quite arduous and aggravating. How do I get this external HD to mount correctly on Sierra? Sierra is seeing a problem that doesn't exist on another OS.
Cannot partition external hard drive mac sierra pro#
I hooked the drive up to my older MacBook Pro and had no problems. I was at my wit's end when I remembered that the drive used to work fine on the previous OS, on another computer. There is a First Aid button that fails to repair anything and tells me that there is an error that may prevent proper booting - "Thanks, Captain Obvious."
Cannot partition external hard drive mac sierra update#
I'll just wait for the next OS update - whenever that may be. I have no reason to access 10 years of work or the resources I have stored on these hard drives multiple times, daily. Permissions will repair themselves when the next OS update comes out. Users are no longer allowed to check/repair permissions on our own now. I concluded from this that the drive may be going bad.ĭisk Utility in Sierra is no longer the help that it used to be. I mounted other devices, including smaller capacity external HDs (one of which has 7 partitions) to any and all of the same ports - No problems at all.
![cannot partition external hard drive mac sierra cannot partition external hard drive mac sierra](https://www.minitool.com/images/uploads/articles/2021/06/best-format-for-external-hard-drive-mac/best-format-for-external-hard-drive-mac-thumbnail.png)
I used a different USB 3 cable from the drive into each of the USB ports - same result. I connected the 'problem HD' to each of the USB ports on my iMac - Same result. I checked my Energy-Saver settings to confirm that 'Put Hard drives to sleep when possible' was disabled. In Safe Mode I was able to mount it and I could see the files inside, but any attempt to open or move these files was a coin toss between success and causing the above process to start, which caused me concern for the potential corruption of the file(s), so I quit doing that. Any attempt to restart the machine will freeze the Mac after the startup tone and cause the external HD and the Mac fans to start (if the external HD has fans - otherwise it just spins so loudly it sounds like fans are running). It can only be disconnected after a shut down. The drive mounts, then it immediately unmounts itself with the typical "eject before unmounting" error, then mounts again, then unmounts and so on, until it is manually disconnected. For months I've been thinking that my drive is going bad. My WD external hard drive - with 2 partitions - will not mount completely/correctly on this iMac. I am running Sierra on my 2015 iMac 27" Retina Display.