For the past couple of months I’ve been using the MNT Pocket Reform. That such a unique little device can exist is a testament to the open source community and the MNT Research team. Its main weakness is that the out-of-the-box Indiegogo configuration is underpowered—for it to be my main machine it needs more storage and a faster CPU.

Thankfully, both are within reach and, while I wait for an R3588 upgrade module, I decided to replace the NVMe SSD with something a little larger. Since the Pocket Reform setup scripts use LUKS-based encryption the migration process is a little more complex than simply imaging and resizing the disk, so I thought I’d write the process up here in case it’s of use to others.

These instructions are loosely based on PhasecoreX’s guide, tailored to the Pocket Reform’s particular off-the-shelf configuration.

These instructions assume you’ve got some way to mount your shiny new (larger) NVMe SSD on your Pocket Reform. I used a cheap USB-C to NVMe adapter.

  1. First-up, download a suitable restore image for your Pocket Reform from https://mnt.re/system-image and write it to an SD card.

  2. Insert the SD into your Pocket Reform and boot into the restore image.

  3. Create a new LUKS partition on the new drive:

    sudo cryptsetup luksFormat /dev/sda
````

This will prompt you to type in a new passphrase that will be used on your new drive.


sudo cryptsetup luksOpen /dev/nvme0n1 new_drive_crypt
sudo cryptsetup luksOpen /dev/sda old_drive_crypt

sudo dd if=/dev/mapper/old_drive_crypt of=/dev/mapper/new_drive_crypt bs=64k status=progress

Reboot

sudo cryptsetup luksOpen /dev/nvme0n1 new_drive_crypt

sudo cryptsetup resize /dev/mapper/new_drive_crypt

lsblk /dev/mapper/new_drive_crypt  (verify size)

sudo vgscan
sudo vgchange -ay reformvg

(Check)
sudo lvdisplay
lsblk

sudo pvresize /dev/mapper/new_drive_crypt

(Not sure this is actually necessary)
sudo lvextend -l +100%FREE /dev/reformvg/root
sudo lvdisplay /dev/reformvg/root

sudo e2fsck -f /dev/mapper/reformvg-root

sudo blkid /dev/sda
sudo cryptsetup luksUUID /dev/nvme0n1 --uuid <old-uuid>