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+# Partition
+
+The partition layout is a bit different on the first part. We prefere GPT every time where is possible. With SoCs they don't support GPT, we can use the hyprid GPT. More about this on [development](development.mnd) documentation.
+
+The system is designed to have less as possible writes on the system. Which means we have basicly just writes on the OTA update and pretty small (5-6 times per week) on the overlay part. The Data partition have real I/O which is possible to offload into a different drive.
+
+Basic it look like:
+
+```
+-------------------------
+|       Bootloader      |
+-------------------------
+|       Kernel A        |
+-------------------------
+|       System A        |
+|                       |
+-------------------------
+|       Kernel B        |
+-------------------------
+|       System B        |
+|                       |
+-------------------------
+|       Bootstate       |
+-------------------------
+|       Overlay         |
+|                       |
+...
+
+-------------------------
+|       Data            |
+|                       |
+-------------------------
+```
+
+Sometime the bootloader part can look different because there can be firmware or SPLs for boot the CPU on the SoC.
+
+## Data
+
+The data partation is the only partition with I/O. This partition can be offloaded to a different drive with the utility:
+```sh
+$ datactl move /dev/xxx
+```
+
+On next boot, the partition will be moved to the new drive. The drive need to be bigger as the old one and we own the full new drive.