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=== Step 1: get the proper /dev ===
From now on we will use a root shell because almost all commands we will use require it.

root@debianvm:~# fdisk -l

...............

Disk /dev/sdc: 14.9 GiB, 16005464064 bytes, 31260672 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Device Boot Start End Sectors Size Id Type
/dev/sdc1 2 31260671 31260670 14.9G af HFS / HFS+


Find the right dev (ie: mine was /dev/sdc and i will use it in the guide).

An Hybrid UEFI GPT + BIOS GPT/MBR boot USB disk is a disk that works on both UEFI and BIOS PCs.

Requisites:

A working Linux installation with the following packages: grub2, grub2-efi, gdisk (on Debian Jessie: grub-pc-bin, grub-efi, grub-efi-amd64, gdisk) An USB drive Some Linux ISO.

Step 1: get the proper /dev

From now on we will use a root shell because almost all commands we will use require it.

root@debianvm:~# fdisk -l

...............

Disk /dev/sdc: 14.9 GiB, 16005464064 bytes, 31260672 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000

Device Boot Start End Sectors Size Id Type /dev/sdc1 2 31260671 31260670 14.9G af HFS / HFS+

Find the right dev (ie: mine was /dev/sdc and i will use it in the guide).