I want to install Ubuntu alongside with my window 7. Currently i have 6 partition with window 7 as C:, D:, E:, F:, G: and H:. My window file reside in C: drive.
What will be the effect on other drives if i install Ubuntu alongside with window install? What will be the effect on data contained in other drives?
As long as each drive as its minimum required amount of free space to operate, then nothing will happen. The data will remain safe as well, each drive is a separate container for data. The only issue you could run into is if the drives become too small after the additional Ubuntu drive.
Some additional info: http://www.tomshardware.com/forum/7832-45-minimum-hard-drive-space-needed