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#31
To reiterate, if you format using the Installer's "Drive options (advanced)" then it will issue the 100mb SysReserved partition.
If you have a blank HD and do nothing with "Drive options," it will likely issue the 100mb Sys Reserved partition, since it auto-creates and auto-formats the partition if you do not.
Only if you have already an pre-partitioned HD or are installing to a pre-formatted partition does installer not issue the 100mb SysReserved partition.
To avoid it on the fly during install if it is issued: simply delete the partition given to install Win7, click on 100mb given for SysReserved partition to expand it to the size you want Win7 to be, format it, Install there.