Using pre-populated HDD in ESXi 5

Hi Guys,

New ESXi user here.  Just a really quick question, if I have a SATA HDD with data already on it (which I want one of the VM's to be able to access (Win7x64Ent)), and throw it in the server and add it as a datastore, will ESXi format it?

If so, what is the easiest way to get my harddrive and all of the files mounted on the VM?

Any assistance would be greatly appreciated!

Thanks,
Matt