Dell EMC Boot Optimized Server Storage-S1 User's Guide

Unable to boot to M.2 drive installed in slot 1

Issue:
When two unconfigured bootable M.2 drives are inserted into the BOSS-S1 device, only the slot 0 drive may be used as a boot drive.
Probable Cause:
Working as designed, BIOS only allows booting from the first listed boot device, in this case, slot 0 per peripheral controller. This only occurs in legacy BIOS boot mode.
Corrective Action:
Remove the drive from slot 1 and install it in slot 0.

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