an image with a partition table understood by the Linux kernel with only a
single partition defined, or alternatively, a GPT partition table with a set
of properly marked partitions following the [Discoverable Partitions
- Specification](https://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/).
+ Specification](https://systemd.io/DISCOVERABLE_PARTITIONS).
3. The image must at least contain one matching unit file, with the right name
prefix and suffix (see above). The unit file is searched in the usual paths,