Currently there's no way to delete old drives. It's on my to-do list.
It's not updating powered on data for your new drives? By default the collector runs once a day, so after 24h you should see a change to that number. If it doesn't can you open an issue on the Github (with logs)?
[Deprecated] Linuxserver.io - Scrutiny
in Docker Containers
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Has the ability to remove old drives been added yet or am I missing it?