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#11
ssd and seagate use both sata cable connected to same inferface? Most likely you need a special driver which you should load when installing win7.
Check the manufacturers website for SATA controller drivers, download and put them on a disk/USB drive, and load them during the install:
https://www.sevenforums.com/tutorials/68505-sata-driver-load-windows-7-vista-setup.html