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File Systems

A computer's file system is the data structures and way it stores, retrieves and updates any files contained in that machine. It allows users to name files and attach attributes to them as well as organizing them in directories (folders) and subdirectories. Modern file systems allow large filenames and can accommodate many unusual characters, but there are still some exceptions that cannot be used in filenames due to conflict with the syntax of the system. The term can refer to both the abstract data structures (trees, hash tables, heaps, etc.) or the implementations of those abstractions in the software/firmware themselves. Files can be stored and file systems used locally in a device's data storage components, through a network protocol or virtually, whereupon files are transferred upon request from off-site devices, or in the case that the files are simply a mapping to a different file system.

Space allocation to files is done in a granular manner by most file systems using physical units on the device. A major part of this space organisation is keeping track of which areas belong to which files and which are free entirely. When the space in memory required by a file does not fit neatly into a multiple of the allocation unit, the spare space is called slack space. Slack space can be minimized by picking an allocation unit size by looking at the average size of the kinds of files you are expecting your system to have to accommodate.

Fragmentation of files occurs when they must be stored in more than one place. For example, if there is not enough memory available consecutively upon their creation for their expected size, or if they expand over their lifetimes beyond the space allocated to them, files may be stored non-contiguously. Too many fragmented files will lower system performance.

Distributed Systems Architectures

I need help with the following questions. Describe the fundamental components of a distributed system. Compare and contrast the advantages and disadvantages of at least 2 distributed system architectures. Use examples to illustrate your points.

General Questions

What is a source code control system? Why is such a system necessary when multiple programmers build a program or system? List and briefly describe the three basic approaches to program development order. What are the advantages and disadvantages of each? Define the terms alpha version, beta version, and production versi


Convert the program of Project 3 to get its input from a data file and to save its output to a different data file. You can base the program on the sample solution to Project 3 if you want to or on your own Project 3 submission if you prefer. The following is the specification for the modified AgeAndWeight program. The pr

Historical and Statistical Logging, File Security and Firewalls

I need the following explained in about 2 paragraphs each the difference between the each of these entities. @ Historical and statistical logging @ File security and firewalls @ Secret and public keys @ Symmetric and asymmetric keys @ Digital certificate and digital postmark

Windows XP Creation Files

I open my computer and create a new folders named Apex Carton, Manufacturing, Material Suppliers, East Coast and West Coast. Then move the East Coast and West Coast folders into the Material Suppliers folder. For the next part of my home work I can't understand what I have to do. Please could you explain it for me step by ste