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 IDENTIFIERĢ: Apple_HFS Macintosh HD 799.0 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ĥ: Microsoft Basic Data BOOTCAMP 200.3 GB disk0s4Īs you can see I've had a go at fixing the EFI partition with the following command: 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. During the install of Windows 7 I wasn't paying complete attention and deleted and formatted the EFI partition.
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