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How do you want the storage device formatted?
 At the time of writing, the ext4 
filesystem is the most common. However, for different workloads, you may consider 
other options (such as XFS). When in doubt, use ext4, but definitely read up on the 
other options to see if they may benefit your use case. ZFS is another option that was 
introduced in version 16.04 of Ubuntu and is also present in 18.04 and now 20.04. 
ZFS won't be discussed in this book as it's currently considered to be in a state that is 
not ready for production use, but it will more than likely become a solid option once 
its implementation in Ubuntu matures. We'll discuss formatting in the next section, 
Formatting and partitioning storage devices
.

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Chapter 9