HELP! Seagate hard-drive

Hi guys,

my seagate hard-drive does not show up on my mac book pro's dekstop anymore. After using it for my mac for about 2 months, i switched to a windows computer. Now, when i try to connect with my mac again, i cant see the icon.

Could the windows computer, automatically have changed the settingd for the hard-drive?

It is very urgent because all my school files are on the drive.

Thanks alot (: