閱讀907 返回首頁    go iPhone_iPad_Mac_apple

reinstall Sierra, unable to unmount startup disk

So, I have a MacBook Pro 2011, and the last three years i Have only installed the upgrades instead of doing a clean reinstallation. I get that my mac is old, and that the HD might be a bit tired, but to get it clean and "factory fresh" would not hurt, as i ecspect that there are alot of unused files clogging up the system.

 

Anyway, i tried to follow apples instructions How to reinstall macOS - Apple Support. However, they do not work. I restart my mac, I have tried command R, option command R, but when i choose disk utility to erase the startup drive i get the message "unable to unmount disk". WT** is this. I have search the web for explanations, and get all these comlicated ways where you need to install Apple OS on a falshdrive (which i don't have), and i wonder why this is necessary when Apple has made a recipe on how to do it themselves. Why is this not working on my MacBook?

 

All my files are backed up on two different HD, both through time machine and manually. I don't want to reinstall through time machine since there are alot of app's and files i do not have use for.

 

So, can anyone explain why this problems occure, and is it possible to get the mac whiped clean so that i at least can try and see if this makes it a bit faster?

The problem occurs because of corruption on the drive that sometimes prevents the drive from unmounting. If the drive is not physically damaged then try booting from a separate bootable disk. This can be any bootable disk even a USB flash drive installer. Disconnect all other external drives from the computer.

 

Boot from the external drive using OPTION boot. Open Disk Utility from this startup drive. You can now use Disk Utility to erase the internal system volume if the disk will unmount properly. If it still won't unmount then I suggest you try the Network Restore assuming your computer came with Lion or later installed:

 

Clean Install of Sierra or El Capitan on a Clean Disk

 

  1. Restart the computer. Immediately after the chime hold down the Command-Option-R keys until a globe appears.
  2. The Utility Menu will appear in from 5-20 minutes. Be patient.
  3. Select Disk Utility and click on the Continue button.
  4. When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.
  5. Click on the Erase tab in Disk Utility's main window. A panel will drop down.
  6. Set the partition scheme to GUID.
  7. Set the Format type to Mac OS Extended (Journaled.)
  8. Click on the Apply button, then click on the Done button when it activates.
  9. Quit Disk Utility and return to the Utility Menu.
  10. Select Reinstall OS X and click on the Continue button.

 

This should install the version of OS X that was pre-installed when the computer was new.

The problem occurs because of corruption on the drive that sometimes prevents the drive from unmounting. If the drive is not physically damaged then try booting from a separate bootable disk. This can be any bootable disk even a USB flash drive installer. Disconnect all other external drives from the computer.

 

Boot from the external drive using OPTION boot. Open Disk Utility from this startup drive. You can now use Disk Utility to erase the internal system volume if the disk will unmount properly. If it still won't unmount then I suggest you try the Network Restore assuming your computer came with Lion or later installed:

 

Clean Install of Sierra or El Capitan on a Clean Disk

 

  1. Restart the computer. Immediately after the chime hold down the Command-Option-R keys until a globe appears.
  2. The Utility Menu will appear in from 5-20 minutes. Be patient.
  3. Select Disk Utility and click on the Continue button.
  4. When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.
  5. Click on the Erase tab in Disk Utility's main window. A panel will drop down.
  6. Set the partition scheme to GUID.
  7. Set the Format type to Mac OS Extended (Journaled.)
  8. Click on the Apply button, then click on the Done button when it activates.
  9. Quit Disk Utility and return to the Utility Menu.
  10. Select Reinstall OS X and click on the Continue button.

 

This should install the version of OS X that was pre-installed when the computer was new.

Doesn't work on my iMac.

I can't install High Sierra, same thing happened when I install Sierra, but the solution I tried then, doesn't work either. ;(

最後更新：2017-09-26 19:57:41

  上一篇：go Disk info lost after making a partition
  下一篇：go Macbook pro retina 2014 model shutsdown rightaw...