Not sure how this happened, but the apparently Rockbox Utility decided that my external harddrive was my Sansa Clip+, and it installed Rockbox on it.
Well, all I see is '.Rockbox' folder so I deleted it, but I am concerned if the bootloader installer damaged index of my external harddrive. I did quick scan on the drive, and did not find any errors.
But this still concerns me. Are there any potential issues on my harddrive?