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P17 Ch 17 File Systems Study Guide Questions Spring 2013 -...

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P17 CIS 230 Chapter 17 - File ManagementSpring 2013Afileis an organized collection of data.T/F.The meaning of the data in the file is established by the program or user.Data files whose records are always retrieved in sequence from the beginning of the file are known assequentialfiles.Some applications require that records be retrievable from anywhere in the file in a random sequence.These are known asrandom access filesor sometimes as relative access files, since the location isfrequently specified relative to the beginning of the file.One common method for retrieving records randomly from a file uses one field, known as theKeyfield,as an index to identify the proper record.T/F.Nearly every file management system supports sequential file access.Files that are accessedsequentially represent the great majority of all files.T/F.Random access assumes that a file is made up of fixed length logical records.The filemanager can go directly to any record, in any order, and can read or write records in placewithout affecting any other record.T/F.One common file representation views a file logically as a collection of records, each made upof a number of fields.The way the user views the file is describing the filelogically.Thephysicalviewof a file represents the way the data is actually stored on a disk.It is a collection ofbits stored in blocks.Usually, the blocks are of a fixed size of 512 bytes.T/F.Physically, the file on nearly every system is stored and manipulated as a group of blocks.Some systems refer to a group of one or more blocks as a cluster.The cluster will correspond toone or more sectors on a single track or cylinder.Theclusteris the smallest unit that the file management system can store or retrieve in a single read orwrite operation.T/F.A file may fit entirely within a single physical cluster, or it may require several clusters.T/F.The blocks that hold a particular file may be contiguous or noncontiguous.Contiguous blocksare stored together.
P17 CIS 230 Chapter 17 - File Management (Page 2)Noncontiguous blocksare scattered all over the disk or tape.T/F.The physical block or cluster size is a compromise between file access speed and wastedspace.The file management system is commonly called theFile managerIt acts as a transparent interfacebetween the user’s logical view of the file system and the computer’s physical reality of disk sectors,tracks, clusters, tape blocks and other I/O vagaries.Thefile management systemprovides a consistent set of commands and a consistent view of files tothe user regardless of the file type, file characteristics, choice of physical device or physical storagerequirements.It translates those commands to a form appropriate for the device and carries out therequired operation.To do so, it maintains directory structures for each device.These, too, are presentedin logical form to the user and to the user’s programs.T/F.The simplest method to allocate storage is to assign contiguous blocks sufficient to hold the

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Term
Spring
Professor
Morgovio
Tags
Operating Systems, File Management System

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