Rosewill RC-209-EX - Manual (Page 16)

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User Manual e-SATA 4 Port PCI Adaptor with RAID RC-209-EX
This will let PC boot from a HDD controller instead of motherboard HDD.
e. Keep the floppy in floppy drive and follow the installation. Press “S” when the screen shows
as the following picture.
Choose the correct OS which you are going to install when system asks you.