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#11
Installer would prompt to let you know it is giving you the 100mb partition then place it on the highlighted drive which you had selected.
A screenshot with the warning prompt is included in this (older, when it was 200mb) tutorial on how to avoid 100mb: How to Avoid 200MB Hidden System Partition From Been Created During Windows 7 Installation My Digital Life
After installer placed it on DISK1, you must have selected DISK0 for your installation.