My Dell G5 5590 has a 250GB SSD and a 1TB HDD. I bought a Samsung Evo 870 1TB SSD, and used Samsung's Data Migration tool to clone from the 250GB to the Evo.
Then, I opened the laptop and installed the SSD. I was expecting to see two 2.5" drives, and replace the 250GB with the Evo, but the 250GB drive is a weird little Hynix chip thing, under the silver panel just above the HDD case in the image below. So instead I replaced the HDD with the Evo.
But now I can't get the laptop to boot from the Evo. I've tried in BIOS to set the sequence to start with the Evo, it still boots from the old one. I disabled the Windows Boot Manager and the old drive from Bios boot sequence completely, but it still boots from the old one. I don't know how to stop it booting from the old drive!? Using bcdedit seems a bit scary if I get anything wrong. Is there a way to get the Evo to be the boot disk, so I can wipe the Hynix?
blkdiscard, assuming it's at least a partially RZAT drive; orwipefsthe partitions and the drive), then install the 1TB back again. (Instead of all the removing/installing manipulation, you may also check whether your UEFI settings allow you to disable SATA port / M.2 slot.)