Expand disk on a 4TB Nvme (Solved see issue)

[paviro]

Hi,
Thank you for this great guide! I am having some difficulties expanding the disk on a 4TB nvme because of the msdos partition table. Any tips on how the image can be adjusted to work in this scenario?

Best,
Paul

[paviro]

I found the solution by recreating the pi image with an GPT partition table (won't boot on old pi's).

Create Empty Image

dd if=/dev/zero of=pi-target.img bs=1M count=4096

Attach base and target image

kpartx -ar "$PWD/pi-base.img"
kpartx -a "$PWD/pi-target.img"

Create boot and root partitions

parted /dev/loop1
> mklabel gpt
> mkpart boot fat32 1MiB 513MiB
> set 1 boot on
> mkpart root ext4 513MiB 100%
> quit

Reattach image

kpartx -d "$PWD/pi-target.img"
kpartx -a "$PWD/pi-target.img"

Copy boot partition

dd if=/dev/mapper/loop0p1 of=/dev/mapper/loop1p1

Format root partitions

mkfs.ext4 -L rootfs /dev/mapper/loop1p2

Continue with guide from

Mount the base image's root partition:
mkdir -p /mnt/original/
mount /dev/mapper/loop0p2 /mnt/original/

---

/etc/fstab needs some adjustment when you are in the chroot:
PARTUUID=8a438930-01 needs to be changed to our new boot partition PARTUUID. You can get it through blkid (see /dev/mapper/loop1p1)

Leaving this open for now so people can find it.