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November 3rd, 2025 01:07

Dell XPS 8900 I Installed a Samsung 990 PRO PCIe 4.0 NVMe M.2 SSD while leaving my original HDD in. Can’t get windows to boot.

Can’t get windows to boot and when I go into Bios I can’t figure out how to change the boot order to my HDD

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14.8K Posts

November 3rd, 2025 01:26

Most users would prefer to make ssd a boot drive and hdd a data storage drive. 
If I had a pc like this I would first clone the HDD to ssd assuming OP used UEFI bios to install OS on the original HDD. 
By clone, I do not install ssd at first, I prepare Windows sys image on an external USB HDD, then remove original SATA HDD, boot pc using recovery usb flash and restore sys image on new ssd assuming ssd is at least same size as original HDD.

When pc can boot from ssd like an exact clone of old HDD, reinstall old HDD and wipe it clean.

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