File System Structure Research Articles

Computerized Soil InL0rmation System of Arable Land in Japan (Part 5) : The Purpose, Structure and Functions of Soil Data File System

Computerized Soil InL0rmation System of Arable Land in Japan (Part 5) : The Purpose, Structure and Functions of Soil Data File System

UNIX Time-Sharing System: A Retrospective†

UNIX∗ is a general-purpose, interactive, time-sharing operating system for the DEC PDP-11 and Interdata 8/32 computers. Since it became operational in 1971, it has become quite widely used. This paper discusses the strong and weak points of the UNIX system and some areas where we have expended no effort. The following areas are touched on: (i) The structure of files: a uniform, randomly-addressable sequence of bytes. The irrelevance of the notion of “record.” The efficiency of the addressing of files. (ii) The structure of file system devices: directories and files. (iii) I/O devices integrated into the file system. (iv) The user interface: fundamentals of the shell, I/O redirection, and pipes. (v) The environment of processes: system calls, signals, and the address space. (vi) Reliability: crashes, losses of files. (vii) Security: protection of data from corruption and inspection; protection of the system from stoppages. (viii) Use of a high-level language — the benefits and the costs. (ix) What UNIX does not do: “real-time,” interprocess communication, asynchronous I/O. (x) Recommendations to system designers.

MERT - a multi-environment real-time operating system

MERT is a multi-environment real-time operating system for the Digital Equipment PDP-11/45 and 11/70 computers. It is a structured operating system built on top of a kernel which provides the basic services such as memory management, process scheduling, and trap handling needed to build various operating system environments. Real-time response to processes is achieved by means of preemptive priority scheduling. The file system structure is optimized for real-time response. Processes are built as modular entities with data structures that are independent of all other processes. Interprocess communication is achieved by means of messages, event flags, shared segments, and shared files. Process ports are used for communication between unrelated processes.

Navigating Unmountable Media with the Digital Forensics XML File System

Some computer storage is non-navigable by current general-purpose computers. This could be because of obsolete interface software, or a more specialized storage system lacking widespread support. These storage systems may contain artifacts of great cultural, historical, or technical significance, but implementing compatible interfaces may be beyond available resources.We developed the DFXML File System (DFXMLFS) to enable navigation of arbitrary storage systems that fulfill a minimum feature set of the POSIX file system standard. Our approach advocates for a two-step workflow that separates parsing the storage’s file system structures from navigating the storage like a contemporary file system, including file contents. The parse extracts essential file system metadata, serializing to Digital Forensics XML for later consumption as a read-only file system.