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Precision 7510 Win 7 Reinstall

I'm having trouble installing our enterprise Win 7 on a new Precision 7510. Been doing this for years on all manner of Dell laptops.

I've followed the instrux posted elsewhere to load SATA drivers onto the USB flash, along with the USB 3 conversion from Intel. I have no trouble loading the driver at the appropriate time.

I get to the point where the Win 7 installer asks where to install Windows. I load the driver, but "Windows cannot be installed to this disk. The computer's hardware may not support booting to this disk. Ensure that the disk's controller is enabled in the computer's BIOS menu."

I can create partitions, delete them, etc. The factory partitions are deleted.

Tried various BIOS settings: Raid is ON, Secure boot is OFF, Boot List option is UEFI, basically all factory settings at this point. I've tried tweaking them, no joy.

One thing, under System Config > Drives, I have four: SATA-0, SATA-1, SATA-3, and M.2 PCIe SSD-0. Is this right?



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