Lemmy.world is just the (only) pre-configured Lemmy instance. But you can add more yourself, e. g. your home instance where your main account lives.

You can add more instances, but don’t have need to sign up on each. Now the cool thing, that makes LiftOff special. You can switch to one of those instances and browse them to view only their local communities or all that are available on that instance. You don’t need an account for this, but you can’t vote or reply directly. However, Liftoff offers to switch to the copy of the same post/comment you’re viewing, that lives on your home instance, where you’re signed up, so you can vote or reply.

You could (but don’t have to) sign up on these other instances. Usually you pick an instance you like most to sign up, then browse the copies (= federation) of other instances that are on your home instances.

But LiftOff allows you to easily browse other instances directly (no copies), like some travel mode. Sign up on these other instances and you have a holiday home there. By this you can e. g. keep your personas separate from each other.

The switch feature is also very handy if you simply want to browse an instance that’s defederated (= no copies of posts/comments are shared) from your home instance.

Did reformat the drive recently to ext4? there’s a background process running that’s doing deferred stuff which keeps the drive busy. try to unmount the drive to ensure it’s idle.

Checkout smartctl. You can either force shutdown immediately or after some idle time. Command is something like this:

smartctl -n -s standby,VALUE /dev/sda with value either “now” or something between 0 and 255. From the manpage:

Values from 1 to 240 specify timeouts from 5 seconds to 20 minutes in 5 second increments. Values from 241 to 251 specify timeouts from 30 minutes to 330 minutes in 30 minute increments. Value 252 specifies 21 minutes. Value 253 specifies a vendor specific time between 8 and 12 hours. Value 255 specifies 21 minutes and 15 seconds.