Clover efi partition on usb drive install#
Clover efi partition on usb drive windows 7#

Also, this will only work if you already have a non-ESP partition in the place of the ESP - if not, deleting partition 1 could be disastrous! In this case, you'll need to move the indices along, as I think the ESP must have index 1. Make sure disk0 is really the disk you want to change - the numbers can change between reboots. To delete your 'bad' EFI partition, run this command: sudo gpt remove -i 1 disk0 You may need to unmount any automatically mounted volumes using diskutil unmountDisk disk0 before proceeding, and in between commands. a USB stick with the OSX installer) or run the mac in target disk mode and do the partitioning from another mac. You can't edit the partition table using gpt while partitions on the drive are mounted, so you'll need to boot from another drive (e.g. Make sure you know what you're doing before proceeding from here - you may lose data if you mess up. If that line doesn't match exactly, the easiest way is to delete the partition in its place and recreate it. You can see the correct EFI partition at index 1. The format is actually a subset of FAT, not HFS+. The GPT entry's type should be C12A7328-F81F-11D2-BA4B-00A0C93EC93B, and if you have a hybrid MBR, the type there should be EE. It should start at sector 40, and it should be 409600 sectors (exactly 200MiB) long. You can recreate the EFI System Partition (ESP) using the command-line gpt tool. My question is (without formatting the disk) how do I create an EFI partition? This didn't seem to create the correct type of partition, it created an Apple_HFS instead of EFI. #: TYPE NAME SIZE IDENTIFIERДў: Apple_HFS Macintosh HD 799.0 GB disk0s2ДЈ: Apple_Boot Recovery HD 650.0 MB disk0s3Д¤: Microsoft Basic Data BOOTCAMP 200.3 GB disk0s4ДЄs you can see I've had a go at fixing the EFI partition with the following command:

Clover efi partition on usb drive install#

Mountain Lion won't install without a valid EFI partition. However now I want to install Mountain Lion and there's a whole heap of trouble. I did notice that the EFI firmware updates failed to install, but paid this no mind. I didn't really realise the significance of this as the machine continued to work fine, booting both into Windows and OSX.

Clover efi partition on usb drive windows 7#

During the install of Windows 7 I wasn't paying complete attention and deleted and formatted the EFI partition.