If you have a 1 TB hard drive partitioned into a 250 GB partition and a 750 GB partition, what you have on the latter will not affect the other, and vice versa. You can share one of those partitions on the network and never worry about people accessing information on the other. One could have Windows installed, riddled with viruses and trojans.
The other could be running a very obsolete, security-hole addled Linux installation. Never shall the two interfere, unless either you make them or the hard drive itself physically dies.
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