Removing OSX from second drive

I installed OSX on a second internal drive so I could run a repair on my main drive. Now I would like to completely remove the second installation without having to re-format the drive. I deleted all the files I thought were relevant with Transmit so I could see the invisible files, but for some reason when I'm in boot camp, Windows still defaults to the drive I removed OSX from when I want to reboot into OSX.

Change the Windows system startup volume using the Startup Disk preferences.
OS X installs nearly 250,000 files in around 69,000 folders. Most are invisible. I hope you got all of them. Erasing the drive would have been faster and better.

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