Customize alternate install CD with UEFI?

Liam Proven lproven at
Thu Jul 21 16:44:43 UTC 2016

On 21 July 2016 at 18:13, Petter Adsen <petter at> wrote:
> It kind of is. The ESP (EFI System Partition) is where EFI bootloaders
> are stored, as UEFI does not store these in the MBR. If you want to
> boot at all, you need this.

Thanks for the clarification. As I said, I'm not that familiar with
UEFI systems!

Question: do you need one on every drive? Or every drive that you boot off?

E.g. My Mac mini has 3 drives: an internal SSD with the OS, an
internal HD with my home directory, and an external Firewire 800 drive
full of Time Machine backups & with (possible emergency-use) Windows &
Ubuntu partitions on it.

Mac OS X seems to feel that they all need EFI boot partitions. If I
partition with the OS X tools, every drive gets one, which it then
hides from view. However, they're plainly visible in Ubuntu. Are they
actually necessary on every drive? I suspect that only the boot drive
needs one...

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