![](img/planet_fs.jpg)

# ThreeFold zstor filesystem (zstor)

Part of the eVDC is a set of Storage Nodes, which can be used as a storage infrastructure for files in any format. 

## Mount Any Files in your Storage Infrastructure

The QSFS is a mechanism to mount any file system (in any format) on the grid, in a quantum-secure way. 

This storage layer relies on relies on 3 primitives of the ThreeFold technology : 

- [0-db](https://github.com/threefoldtech/0-db) is the storage engine.
It is an always append database, which stores objects in an immutable format. It allows keeping the history out-of-the-box, good performance on disk, low overhead, easy data structure and easy backup (linear copy and immutable files).

- [0-stor-v2](https://github.com/threefoldtech/0-stor_v2) is used to disperse the data into chunks by performing 'forward-looking error-correcting code' (FLECC) on it and send the fragments to safe locations.
It takes files in any format as input, encrypts this file with AES based on a user-defined key, then FLECC-encodes the file and spreads out the result
to multiple 0-DBs. The number of generated chunks is configurable to make it more or less robust against data loss through unavailable fragments. Even if some 0-DBs are unreachable, you can still retrieve the original data, and missing 0-DBs can even be rebuilt to have full consistency. It's an essential element of the operational backup. 

- [0-db-fs](https://github.com/threefoldtech/0-db-fs) is the filesystem driver which uses 0-DB as a primary storage engine. It manages the storage of directories and metadata in a dedicated namespace and file payloads in another dedicated namespace.

Together they form a storage layer that is quantum secure: even the most powerful computer can't hack the system because no single node contains all of the information needed to reconstruct the data.

![](img/quantum_safe_storage.jpg)

This concept scales forever, and you can bring any file system on top of it: 
- S3 storage 
- any backup system
- an ftp-server
- IPFS and Hypercore distributed file sharing protocols 
- ...

![](img/quantum_safe_storage_scale.jpg)