A technical told me about the EFI partition that...
- ...it's only there in case your computer will do an EFI update so the update files can be loaded onto the EFI partition.
This is consistant with what Wikipedia says:
- The EFI partition is initially blank and not used for booting. However, the EFI partition is used as a staging area for firmware updates.
Apples's Software Update utility does not update the firmware of non apple hardware.
Why then does Disk Utility create EFI partitions on external disks?
/dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *500.1 GB disk1 1: EFI 209.7 MB disk1s1 2: Microsoft Basic Data HEAP 150.0 GB disk1s2 3: Apple_HFS Backup matt 150.1 GB disk1s3 4: Apple_HFS Freedom 199.5 GB disk1s4