is about File Management

timer Asked: Nov 12th, 2016

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i need u to check from the answers first and then paraphrase them as much as bosibole

ITEC 274: Assignment 5 – File Management Cornelio Reyes ITEC 274.001 Individual Assignment Answer the questions below thoroughly and completely (one sentence answers will not be sufficient). Use your own words (this is not a Google copy and paste exercise). Submit answers for the assignment in this word document via BlackBoard / Assignments. Assignments without names will not be accepted/graded. 1. What is a file? What are the 2 primary types or categories of files? A file is a piece of information that can be stored anywhere in the computer. A file can essentially be part of something simple of be crucial OS file. The main types of categories for a file are program files and data files. A program file is a file that is part of a program and contains executable instructions. A data file would contain data that was either created by a program or is used by a program. 2. What is file management? What are the 4 main functions involved in file management? The file management system in a computer is responsible for making, deleting, changing, and controlling access to files. It has four main responsibilities, it must know where each file that has been created is located, implement some sort of policy for those files, allocate memory for files, and remove files that are no longer in need. All of these responsibilities are crucial and all of them must be working together. If one fails then the others will not work at all or not work properly. 3. Identify and describe the 6 components of the data hierarchy The 6 components of the data hierarchy are a bit, a byte, a field, a record, a file, and a database. A bit is simply the smallest data element possible. A byte represents 8 or 16 little bits that are put together to create a character. A field is a bunch of bytes that a user has put together such to create something like names. A record is fields that are related to each other somehow, a record can be thought of as the row. A file is a group of records that are related and is generally data used by a specific program application. Finally a database is a group of related files that are connected to each other at various levels. 4. What is a volume? What is multi-file volume? What is a multi-volume file? A volume is a storage area with one file system that is part of a partition on a hard disk. The most common type of file system used on a windows volume is NTFS. Apple OS uses a different type. Windows also assigns a drive letter to each volume. A multi-file volume is a type of volume that contains many files while a multi-volume file is a volume that has large files that are spread throughout several volumes. 5. What is a directory? What is an MFD? What are the two main items a directory may contain? A directory is sort of a container or cabinet that is used to organize files and other directories. The main directory folder where all the other files and folders are stores is called the root directory. Other folders stored inside the root directory are called subdirectories. A directory can contain multiple files and folders within itself. A MFD is a master file directory, this MFD is stored right after volume descriptor, and it lists the name and characteristics of each file in the volume as well as subdirectories. The two main items a directory contains are files and folders. 6. Describe the file directory tree structure. What are the main components? The file directory tree structure is simple to understand because it is basically an inverted tree of how the files are laid out. If you start from the top and work your way down then that the folders all the way at the bottom or any folder working your way down would be a subdirectory. The main folder on the top is the MFD, this is the root folder for the rest of the files and subdirectories. Each branch shows each other folder created and it is possible to have a folder inside a folder. The main components of the tree structure is the MFD and each subdirectory and file. 7. What 2 main components make up a file name in most modern day operating systems? What is a path name? What is a relative file name? What is an absolute (complete) file name? The two main components that make up file name are the relative filename and extension. The relative file name includes the name of the file with no path, appears in the directory listings, has a different file name than other files, and varies in length. A path name is a listing of the exact location of the file, it is usually followed by a series of backslashes depending on the location of the file. An absolute file name unlike a relative filename actually includes the path information. 8. Compare and contrast DOS / Windows / Linux / Unix / Mac OS file name conventions in terms of maximum character length, case sensitivity, support of special characters and requirement of file extensions. UNIX, Mac OSX, and Linus are all case sensitive and do not require an extension. Windows and MS-DOS are not case sensitive. UNIX and Linux allow for the most amount of special characters allowed. Max OSX only allows a colon, Windows won’t allow most and MS-DOS only allows hyphen and underlined word. UNIX MAC OSX and Linux don’t require and extension while Windows and MS-DOS do. UNIX Windows and Linux all allows a maximum character length of 256 while mac allows one less and MS-DOS only allows 8.3. 9. Identify and describe the 3 types of physical file organization. Physical file organization is how files arranged throughout the hard drive. The three main types of organizations are sequential, direct, and indexed. Sequential records are stored serially, they are easy to implement, and to search for something you must start at the beginning and work your way down until the file is found. Direct organization allows for direct access to files, requires direct access storage device implementation and uses relative address record identification. Indexed sequential is the best out of the other two because it uses Indexed sequential access method software which has a lot of benefits compared to the other two. 10. What is file access control? Why is it needed in modern day operating systems? What are the 5 main levels of file access control? File access control is controlling what kind of access a user has to a specific files or set of files. The types of file access control levels that are available are Read only, Write only, Execute only, Delete only, or a combination of any of these. It is needed in modern day operating systems because it is an incredibly useful tool when an admin is trying to setup computers for a company or a school. The admin account would be allowed to install things such as a printer driver so he would have read and write access but this would not be ideal for the user to have. Therefore that write access can be denied for general users to prevent them from messing something up.

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