Implement disk volume class.
Add mock to requirements.
Refactor. Move.
Refactor.
Add value extractors.
Add System Verificators.
Implement disc volume class.
Add file system backend.
Refactor.
Add description to value extractor.
Refactor.
Add specialized exceptions for RangeVerificator boundries.
Add Logger.
Add verification suit.
Add date to verification suit.
Add verification suit failure function.
Add FailureReportFactory.
Add print report action.
Add verification runner.