"gpt remove: unable to open device '/dev/disk0': Resource busy" Then delete the Windows partitions on your main disk with gpt: Unmount the CoreStorage volume first and then the main disk: dev/disk3 - /dev/disk13 part of the Recovery System
If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting.Īlternatively you may start from a bootable installer thumb drive (Mavericks or Yosemite) or a thumb drive containing a full system (Mavericks or Yosemite).įirst you should get an overview of your disks and the partition layout:Ĥ: Microsoft Basic Data BOOTCAMP 41.4 08 disk0s4ġ: Apple_partition_map EFI 30.7 KB disk1s1Ģ: Apple_HFS OS X Base System 1.3 GB disk1s2Ġ: Apple_HFS Macintosh HD *209.0 GB disk2 I recommend ethernet because it's more reliable. On a 50 Mbps-line it takes about 4 min (presenting a small animated globe) to boot to a recovery netboot image which usually is loaded from an apple/akamai server. The prerequisites are the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated. Restart to Internet Recovery Mode by pressing You hosed your GUID partition table by manipulating it from inside Windows 10.ĭetach any external drive (especially an external Time Machine backup drive). But deleting it isn't the real reason why you can't boot. The small partition you've deleted is your on-board Recovery HD. The Recovery Mode even gives me the option to boot into my Mac partition, but doing so results in a black screen. I booted into Recovery Mode using cmd + r and ranīesides, the Macintosh HD partition is also shown in Disk Utility: Now my question is: How can I recreate the deleted partition in order to be able to reboot into OS X?
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