We have old 742i-600, we can’t get the 5.25” bay removed( there’s no release tab or similar thing ), and the user manual does not mention anything about how to remove it. Do you have some SOP or instruction on how to do this?
http://www.supermicro.com/manuals/chassis/tower/SC742.pdf
Please release the screws of 5.25” drive from SC742 and the 5.25” drive can then be removed.