MikroTik RouterOS is built on a modified Linux kernel, originally optimized for IDE CD-ROM drives. When the boot process begins, the kernel looks for a specific ATA/ATAPI bus (the connection standard for old CD-ROM drives). If it cannot find the expected hardware controller, it throws this fatal error.
MikroTik RouterOS ISO images are designed primarily for CD-ROM boot. Unlike many Linux distributions (Ubuntu, Debian) that support hybrid ISO/USB booting, the RouterOS installer uses an older initramfs script that explicitly checks for the presence of a CD-ROM device containing the installation files. If that check fails, it triggers the fatal error. fatal error no cd rom found mikrotik full
Depending on your installation method, use one of these solutions: MikroTik RouterOS is built on a modified Linux
If you search for "fatal error no cd rom found mikrotik full," the keyword "full" is critical. Here is why: Thus, the error is most prevalent among users
Thus, the error is most prevalent among users who want the complete RouterOS experience on old x86 hardware.
Your hardware is too new. The legacy kernel lacks drivers for your motherboard chipset. Abandon the ISO and use the CHR dd method from Part 4.