docs: Readme (#580)

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@ -201,20 +201,20 @@ docker run -it --rm -p 5000:5000 --device=/dev/kvm --cap-add NET_ADMIN --stop-ti
* ### How do I pass-through a disk?
When running the container inside a virtualized environment, it can be handy to pass-through disk devices directly instead of binding a folder containing an image. As these devices are already backed by an image on the host, this will remove an extra layer.
This allows for easier management and higher performance. To do so, you can add those devices to your compose file:
It is possible to pass-through disk devices directly by adding them to your compose file in this way:
```yaml
environment:
DEVICE: "/dev/sda"
DEVICE2: "/dev/sdb"
DEVICE2: "/dev/sda"
DEVICE3: "/dev/sdb"
devices:
- /dev/sda
- /dev/sdb
```
Please note that the device needs to be totally empty (without any partition tables) otherwise DSM may not format it into a volume.
Please note that the device needs to be totally empty (without any partition table) otherwise DSM does not always format it into a volume.
Do NOT use this feature with the goal of sharing files from the host, they will all be lost without warning when DSM creates the volume.
* ### How do I install a specific version of vDSM?