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docs: Disk pass-through (#715)

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@ -119,6 +119,8 @@ docker run -it --rm --name dsm -p 5000:5000 --device=/dev/kvm --cap-add NET_ADMI
- /dev/disk/by-uuid/45678-45678-45678-45678-45678:/dev/disk3
```
Make sure to bind the disk via its UUID (obtainable via `lsblk -o name,uuid`) instead of its name (`/dev/sdc`), to make sure it can never accidently pass the wrong disk when their name assignments get shuffled.
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.