If I don't want to use my Seagate hard drive anymore for Time Machine...How do I go about this?

I want to use the external hard drive still, but not as my back up disk for Time Machine anymore. How do I make it so that my Macbook doesn't associate this specific external hard drive with TM when I plug it in?
Thanks

chenango232 wrote:
Missing a pretty big step here....  How does one install a new OS on an external drive?  You can't install an OS without first booting into an OS.  I don't have a disk to boot to, but have gotten as far as downloading the install software.  Perhaps the answer you should be providing is that I need to create an install disk somehow?
Is not the current HDD in your MBP a boot drive?  If so and you have Yosemite installed, you can boot into the recovery partition.  From the 4 option menu you can use Disk Utility.  If you have the NEW HDD connected to the MBP it will appear in Disk Utility.  Click on that drive to format in Disk Utility>Erase.  After formatting, go to the 'Reinstall OSX' option and install the OSX onto the external HDD.  When finished swap the drives.
Ciao

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