What is a .ROMFS file?
romfs is a simple read-only filesystem used in embedded and boot images.
- Did you know
- romfs trades features for simplicity, fitting where space is tight.
- romfs is a minimal read-only filesystem that has shipped in the Linux kernel since version 2.1.21, popular for boot disks and embedded devices.
- It stores files sequentially on 16-byte boundaries and protects the start of the image with a checksum, trading features for tiny code size.
- What Analyser reads
- Inspect virtual-machine descriptors (VMware .vmx, VirtualBox .vbox, OVF/OVA), disc images (Nero .nrg, Alcohol .mds/.mdf, CloneCD), embedded firmware (Intel HEX, Motorola S-record, UF2, ELF/AXF, Device Tree Blobs, U-Boot uImage), partition tables (MBR/GPT with GUIDs), Linux filesystem superblocks (ext2/3/4, SquashFS, cramfs, romfs) and Windows imaging (WIM/ESD) - reading headers directly, no upload.
- Depth of analysis
- .ROMFS is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .ROMFS file
- Drag a .ROMFS file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.