(First leave some unpartitioned space in start of the disk by moving partitions or backing up data) Command (? for help): nįirst sector (34-1953525133, default = 40) or : 512M You can create it with gdisk (GUID fdisk): The following error appears if disk has GUID partition table and doesn't have EFI system partition (or it is less than 200 Mb): Error: -5344: MediaKit reports not enough space on device for requested operationĮven if you are not planning to use this external HDD for booting, Mac OS's Disk Utility requires this partition to exist.
