This is the driver. To use this driver, you must first run it to extract the contents, then put the extracted folder on your installation USB (or on a USB), then when it says no drives found, browse to that folder. [URL] Server 2008 R2 is obsolete and past end of life ... why are you using that? I would recommend Server 2016 or 2019 instead. The installation media you are using for 2008 R2 must have SP1. 
hi guys i have been given a dell 310 server to use as a home server.   the os wasnt installed when i got it but im trying to run server 2008 r2 on there x64,   but when i try to install windows it says there is no drives found ????   i have configured them in raid and that appears to be fine.   i have no drivers for it and cant seem to get any to work,   it has the perc H700 card in there if that helps,     thanks for any help
Power Edge R310 No Drives Found During Installation