CHR is a virtual machine image perfect for modern server hardware that doesn't require the physical hardware drivers of the x86 version.
The installer often expects a legacy IDE interface. If your BIOS is set to AHCI mode for SATA controllers, the installer may fail to "see" the optical drive or the USB emulation.
The "Fatal Error: No CD-ROM found" error can be caused by several factors, including:
The error indicates that the RouterOS installation environment (booted from ISO, USB, or image) cannot detect or properly communicate with the installation media device, or the storage controller (IDE/SATA/SCSI/NVMe) required to read the media. Common causes include: fatal error no cd rom found mikrotik full
"FATAL ERROR: no CD-ROM found" typically occurs when installing MikroTik RouterOS on x86 hardware because the installer cannot find a compatible CD/DVD drive to continue the setup . This is often due to missing drivers for modern controllers or certain Intel chipsets (like ICH9R) in older versions of the software. MikroTik community forum Complete Error Text
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The machine is booting in UEFI mode, but the RouterOS installer requires Legacy (BIOS) mode. CHR is a virtual machine image perfect for
By switching from ISO to direct image writing ( .img ) or properly configuring the virtual IDE controllers, the "Fatal Error: No CD-ROM Found" issue can be resolved, allowing for a successful MikroTik RouterOS installation.
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.
The hard drive controller is set to SATA or AHCI, which some older RouterOS installers cannot interface with during the initial loading phase. The "Fatal Error: No CD-ROM found" error can
It then tries to mount /dev/cdrom to /cdrom and look for the packages directory. If you have access to the boot console (e.g., via Ctrl+Alt+F2 during boot), you could manually create a symlink from your USB device to /dev/cdrom , but this is complex and not recommended.
Ensure your Hard Disk bus/device is explicitly set to instead of SCSI or VirtIO. Ensure the CD-ROM drive is also attached via the IDE bus.
Older versions of RouterOS (especially RouterOS v6 and earlier) lack native drivers for modern AHCI or RAID storage controllers.
This is one of the most common hurdles when moving from standard Linux distributions to MikroTik’s proprietary installation environment. It usually happens when the installer cannot locate the installation media it expects, or when the underlying hardware detection fails.