ASROCK D21G3D4I2-2T User Manual page 44

sSATA/M.2_SATA Mode Selection
Identify the sSATA port is connected to Solid State Drive or Hard Disk Drive. Press
<Ctrl+I> to enter RAID ROM during UEFI POST process.
sSATA ALPM
Use this item to enable or disable Support Aggressive Link Power Management.
M2_1(sSATA) / M2_2(sSATA) / M2_1(PCIE) / M2_2(PCIE)
Depending on how many SATA ports you have, you will see sSATA_x (x means number)
listed on the screen, with its status indicated as sSATA device [(Model Name)] or [Not
Detected].
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