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File Format
Name SeqBox
Extension(s) .sbx, .seqbox
Released 2017

SeqBox - Sequenced Box container

SeqBox - Sequenced Box container

SeqBox (Sequenced Box container; SBX) is a single file container/archive that can be reconstructed even after total loss of file system structures.

An SBX container is composed of a collection of blocks with size sub/equal to that of a sector, so they can survive any level of fragmentation. Each block has a minimal header that includes a unique file identifier, block sequence number, checksum, version. Additional non critical info/metadata are contained in block 0 (like name, file size, crypto-hash, other attributes, etc.).

If disaster strikes, recovery can be performed simply scanning a volume/image, reading sector sized slices and checking blocks signatures and then CRCs to detect valid SBX blocks. Then the blocks can be grouped by UIDs, sorted by sequence number, and reassembled to form the original SeqBox containers.


A SeqBox files start with bytes 53 42 78, or "SBx" in ASCII.

Format description


  • SeqBox, Marco Pontello's Home Page
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