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Issue description

Garbled sentence in Chapter 13 > Identify File Systems and Devices > File Systems, Storage, and Block Devices > First paragraph, last sentence:

"A block device must be optionally partitioned, and a file system that was created before the device can be mounted."

I believe what was meant was something like:

"A block device may have a filesystem created directly on it or it may be partitioned into one or more block devices with different filesystems created on each."

Steps to reproduce:

Workaround:

Expected result: