Up: Understanding the Disk Partitions
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The last, but a very important partition is the / partition. The / partition contains the /root, /etc, and /sbin directories. That is why they cannot be made separately. The / partition needs to be big enough for all of these and for everything you did not already allocate. It is usually a good idea to make it at least 5 GB. Remember that the /root directory is included in this so everything that root wants to do in secret will have to be done in this space.