Skip to main content

How to erase Filevault encrypted volume in case system fails to boot or you just want to format disk and re-install OSX on the system.

             There might be situation with FileVault where the OSX might not be booting normally or sometimes OS X does not allows you to erase or turnoff the encryption ( Performed using Disk available with OS X installer ). This can be a problem with FileVault 2-encrypted volume which will not let you either unlock or decrypt it. In such cases the following method will help you in deleting the core storage( FileVault encrypted) volumes on the system.

To perform this :

  1. Connect the OS X installer USB/Disk to Mac.
  2. Power on the Mac.
  3. Hold option key on keyboard and boot into OS X Installer.
  4. Open the from Utilities in OS X installer application.
  5. Run the following command to get the details about the FileVault encrypted volume. 
          diskutil cs list

          This will show detailed information about the core storage volume available on the system.Unless you have more than one volume on the OS X system which is encrypted as well, you should have only one volume listed as core storage volume under Logical Volume Group(LVG). Please refer to the below screen shot volume for identifying the LVG information.

      6. Now run the below command to delete the Logical volume group from the system.

           diskutil cs delete LVG-ID

           Example : 

           The above command will delete the corestorage volume and reformat the disk as  plain HFS+ volume.
       7.  Quit the Terminal Application , Continue with the regular OS X installation steps. 



Popular posts from this blog

How to find firmware or boot ROM version in Mac OS X

Firmware and boot ROM version of your mac can be found in two ways.
Way 1 :
1. From "Apple" menu , choose "About This Mac" menu item. 2. Click " More Info " to open "System Profiler" application. 3. Under Contents -> Select Hardware Tree item.
On the right side panel Under hardware overview section, we can see Boot ROM Version and SMC (Firmware) Version.

Way 2 :
Run the below command in terminal to get boot ROM version and SMC(firmware) version :
$ system_profiler SPHardwareDataType | grep -i "Version" | awk -F ':' '{print $1 $2}'

How to disable USB ports on Mac OS X Mavericks, Yosemite or El Capitan ?

We might wonder how to disable the USB ports on Mac to prevent data copy to external USB mass storage devices. The USB kext on os x is loaded at the time of start of the system, this can be loaded / unloaded using kextload or kextunload command. To disable USB port on Mac , follow below steps:
On Macs running Mountain Lion, Mavericks  and Yosemite:
Unmount any connected USB devices to the system by running below command                  $diskutil unmount /Volumes/USBDISK.Now unload the USB related kernel extensions in the following order using kextunload command.sudo kextunload -b
sudo kextunload -b
sudo kextunload -b

       This will unload the USB kext and disable the USB ports for storage devices on Mountain Lion, Mavericks  and Yosemite.
On Mac running El Capitan:
Unmount any connected USB devices to the system by running below command                  $diskutil unmount /Volumes/USBDI…