Is it possible to reformat and erase ONLY ONE partition of the same drive?

Hello,
Title really says it all....can this be done on the same drive, while leaving the other partition intact?
I was thinking of partitioning 50/50 - one for Time Machine and the other for important files.
Thank you in advance.

Of course you can.
Open Disk Utility and format the drive as a Mac OS X Extended (Journaled). After that you can partition the drive. Each partition can then be formatted, erased and repaired individually.
HOWEVER - please note that it is not advisable to run Time Machine and other important files from the same physical drive! If the drive fails, you lose all the data on it. Hard disks are cheap and I suggest you always have a backup of inportant data on another drive. Hard drives WILL fail, it is just a question of time!

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