The error is a ghost of computing past—a legacy kernel expecting an IDE CD-ROM in a world of NVMe and AHCI. You now have three complete solutions:
The error typically occurs when the MikroTik RouterOS installer boots but cannot find the media it was launched from to continue the installation . This most often happens when using modern SATA CD-ROMs, USB CD-ROMs, or incorrectly formatted USB flash drives. Core Solutions fatal error no cd rom found mikrotik full