All About Linux: Effective Partitioning–The How and Why of It

“A few days back, when my non-techie friend came to visit me at
home, he was amazed to see me booting into multiple OSes (4 to be
exact) on my machine. He then wanted to know how I accomplished
this feat. I told him about creating partitions and how these
partitions play a vital role in installing multiple operating
systems on ones machine. But this conversation with my friend set
me thinking; why is there so much fuss on creating partitions? I
think the primary reason that people face this issue of
re-partitioning is because they do not think ahead about their
future needs…”

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