### Design
 - [ ] Testing: unit tests/integration tests (? what does it even mean in this case)/performance tests
 - [ ] Implement standard java...File interfaces/create separate interfaces?
 - [ ] Don't allocate cluster for empty files
 - [ ] `iNodes` vs `array` vs `B-Tree`
 - [ ] Resource locking (`RWLocks` on segments)
 - [ ] Resource release in case of h/w failures e.g. power outage
 - [ ] File corruption
 - [ ] External file modification. Prevention and detection
 - [ ] Fragmentation
 - [ ] File sizes (does it matter?)
 - [ ] Performance of concurrent writes. Can threads write to separate segments of a file concurrently?
 - [ ] Delaying of operations
 - [ ] What to choose in java? `RandomAccessFile` or smth more fancy
 - [ ] Really atomic writes for metadata/userdata
 - [ ] Retries on timeouts or temporary disk failures
 - [ ] Dynamic resize/reallocation vs constant size vs expensive (?) static resize operation
 - [ ] Possible consequences of underlying outage while reading ?
 - [ ] Error handling: fancy exceptions
 - [ ] What to include in metadata?
 - [ ] Modification events? Callbacks/actors? How to notify without executing?
 - [ ] Decide on supported operations:
     * Create
     * Read
     * Write
     * Delete
     * Move
     * Copy
     * Rename
     * List
     * Find
     * Permissions
         * Set
         * Modify
         * Check
 - [ ] Checks for integrity/format correctness on initialization with existing FS
 - [ ] Wait for writes on shutdown or just disable?
 - [ ] Fair/unfair waiting on locks for data blocks?
 - [ ] How to react on simultaneous writes to the same block? Allow to write to the same block or say it has to be open?
 - [ ] Storage spec versioning?