How Can You Fix - Can some one explain how a hard drive partion works??

Can some one explain how a hard drive partion works?

My hard drives have been split into a 'main' and 'secondary'
The problem is that the other day I shut down my PC and when i next started it up, it was running off the secondary hard drive instead of the main.
Is there a way, without deleting the partition, to switch between the two?

I hardly know anything when it comes to computers so simple answers would be nice
cheers

Solutions to the Problem Can some one explain how a hard drive partion works?

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