Ok va voir dans le manuel p13 https://fr.msi.com/Motherboard/support/Z270-GAMING-PRO#down-bios
Merci à @Delta
Section Storage il est indiqué :
Intel® Z270 Chipset
y 6x SATA 6Gb/s ports*
y 2x M.2 slots (Key M)
Support up to PCIe 3.0 x4 and SATA 6Gb/s
Support PCIe 3.0 x4 NVMe U.2 SSD with Turbo U.2 Host
Card**
M2_1 slot supports 2242/ 2260 /2280/ 22110 storage
devices
M2_2 slot supports 2242/ 2260 /2280 storage devices
Intel® Optane™ Memory Ready for all M.2 slots ***
y Supports Intel® Smart Response Technology for Intel
Core™ processors
* The SATA1, SATA5 and SATA6 ports will become unavailable with some
conditions of M.2 devices. Please refer to page 15 for M.2 & SATA
combination table.
** The Turbo U.2 Host Card is not included, please purchase separately.
***Intel® Optane™ Technology is only supported when using 7th Gen processors.
Before using Intel® Optane™ memory modules, please ensure that you have
updated the drivers and BIOS to the latest version from MSI website.
Donc si tu as ton disque sata sur les ports 1 , 5 ou 6 il peut être désactivé comme indiqué ci dessous