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how to install on big memory card (128 or 256 GB) with grub in ext4 and start first through the grub menu one of our minimal Live ISO's (and later full installations in the same or different partitions, such a big memory card on USB adapter let all possibilities open!)
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Install to the card like it's another hard drive. Make sure the bootloader gets installed to the mbr of that drive. If you want it to be uefi compatible, you will have to do some different things.
Once the installation is done and you know you can boot into it, copy the live-iso into that system and create a grub menu entry to boot the .iso file directly. See these:
https://dev1galaxy.org/viewtopic.php?id=2334
https://dev1galaxy.org/viewtopic.php?pid=6176#p6176
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