The installer environment may not support USB 3.0 (blue ports) controllers natively during the boot phase.
Note: If you are using modern hardware that completely lacks an IDE compatibility mode, you may need to upgrade to RouterOS v7, which features a newer Linux kernel with vastly improved hardware and AHCI/NVMe support. Method 2: Use the Right USB Imaging Tool and Port
To avoid this error in the future or when setting up new hardware, follow these best practices: fatal error no cd rom found mikrotik full
If you continue to see the error after trying these steps, verify that your boot media contains a valid RouterOS installation and that the target disk (HDD/SSD) is properly detected. The error may sometimes mask a deeper issue with disk controller drivers.
RouterOS does not include USB drivers for all chipsets, which is why USB CD-ROM drives or USB flash drives may not be detected. The installer environment may not support USB 3
If you are trying to install the "full" version, the official, error-proof method is . This bypasses the CD-ROM requirement entirely.
Once you apply one of these methods, reboot your system. The installer will bypass the "No CD-ROM found" error, format the target storage drive, and present you with a prompt to select your desired packages. After a successful installation, remember to revert your boot priority settings so the system boots directly from the newly installed hard drive or flash disk. The error may sometimes mask a deeper issue
MikroTik RouterOS uses a Linux kernel, but the installation process is highly specialized. Unlike a standard Ubuntu or Windows installer that scans aggressively for any connected storage, the MikroTik installer (especially older ISO versions) often looks for a strictly defined "CD-ROM" device path.