hdd not detected on bios

ulsss

Estimable
Aug 12, 2015
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hi all
I bought new laptop(acer vn7 571g) 3days ago and Originally this laptop comes with 1TB+8ssd sshd. I told to my provided to install Kingston SM2280S3/120G M.2 SATA SSD .now i have two drive.
but i have problem. often on bios the ssd and hdd not detected and some time ssd and hdd are detected.
i tried change legacy to uefi but on difference.
how can I fix this problem ?
Thanks