Boots Old HDD instead of New HDD when both plug connected

[serturk]

Hello and thank you in advance

I install windows 10 on a new ssd to replace my sons old hdd. when i have the ssd plugin in alone it boots up no problem everything works great. When i connect the old HDD with the new ssd, the new SSD in sata 1 and the old hdd in sata 2, the computer still boots up the old HDD, i went into bios and disable it to boot the old HDD but stills boots the old HDD. i have not reformatted the drive yet, hoping to give it a couple weeks or so till he confirms everything is good.

Can i fix this, or is there some sort of issue with windows that recognizes the old HDD first as some sort of legacy thing.

Thanks

 

[CountMike]

Did you try to reverse places where SSD and HDD are connected to MB ?