Ppt on disk formatting program

Mass storage Structure Unit 5 (Chapter 14). Disk Structures Magnetic disks are faster than tapes. Disk drives are addressed as large one- dimensional.

the bootstrap. – Tiny bootstrap loader which in turn loads the full bootstrap program – Partition containing the bootstrap program is called boot disk Disk Management Bad block: One or more sectors are defective, these are called bad blocks. MS-DOS format: – do a logical format – Mark the bad blocks as unusable Sector sparing: – Low level formatting keeps spare sectors – Each bad sector is replaced with one such spare/


Disk Structures. CTEC 1102 Formatting a Disk Two parts to formatting a disk:  Low-level (physical) formatting  High level (logical) formatting Low-level.

 Press any key to restart Windows uses boot sector to identify the type of disk. Disk Structures (31 slides) CTEC 1107 FAT16, VFAT, and FAT32 Disk Structures (31 slides) CTEC 1108 FAT15, VFAT & FAT32 FAT ‘s formatting program creates:  Boot record  File Allocation Table (2 copies)  Root directory Logical Structure  of a Disk Disk Structures (31 slides) CTEC 1109 FAT15, VFAT & FAT32  FAT is a map of/


Chapter 4: What is an operating system?. What is an operating system? A program or collection of programs that coordinate computer usage among users and.

special tasks Then the OS starts behind-the-scenes programs (services) for special tasks –Monitoring email, coordinating printing requests, monitoring data on the network. What can’t Windows read Mac or Linux disks Different OS’s define tracks and sectors differently on the diskformatting Different OS’s define tracks and sectors differently on the diskformatting Windows machines do not know how to interpret Mac/


Ch 1 - Introduction to Computers and Programming Hardware Terminology Main Memory Auxiliary Memory Drives Writing Algorithms Using Pseudocode Programming.

the computer system to access (read from and write to) data on a storage device. A disk drive is a drive for a hard disk, a CD, or a DVD. When using your computer, you’ll sometimes need to copy data/code as the result. Source code is the formal term for programming language instructions. Object code is the formal term for binary-format instructions. 11 The Compilation Process for Non-Java Programs source code (programming language instructions) object code (binary instructions) Programmers write this. /


©Silberschatz, Korth and Sudarshan11.1Database System Concepts Chapter 11: Storage and File Structure Overview of Physical Storage Media Magnetic Disks.

are cheap, but cost of drives is very high Very slow access time in comparison to magnetic disks and optical disks  limited to sequential access.  Some formats (Accelis) provide faster seek (10s of seconds) at cost of lower capacity Used mainly for backup/Each leaf block of the tree stores between half and 1 block worth of data from the object Special-purpose application programs outside the database are frequently used to manipulate large objects:  Text data treated as a byte string manipulated by /


System Software – Utility Programs and Translators Describe the purpose and use of common utility programs for computers security (anti-virus, spyware.

programs for computers security (anti-virus, spyware protection and firewalls), disk organisation (formatting, file transfer and defragmentation), and system maintenance (system information and diagnosis, system clean up tools and automatic updating) Utilities Technically the OS is the software that controls and manages the computer system, but most OS’s also include programs/: might be the shared drive on your school network. The disk formatting also includes setting up an empty file system which will allow/


Understanding and Troubleshooting Your PC. Chapter 5: Understanding, Installing, and Troubleshooting Disk Drives2 Chapter Objectives  In this chapter,

and view the stored data  Formatting is the process of preparing a disk for reading and writing by defining how files will be organized on the disk –Low-level (physical) formatting –Partitioning –High-level (logical) formatting Chapter 5: Understanding, Installing, and Troubleshooting Disk Drives6 Low-Level Formatting  A hard disk must be physically formatted before it can be logically formatted  Low-level formatting of a hard disk is accomplished by writing a/


Utility Programs Lesson Objective: Understanding the functions of an operating system. Learning Outcome: Answer some basic questions on operating systems.

off the contents. The software used to format a disk is called … A disk formatter (doh!) Disk Defragmenting A computer hard disk can become cluttered (like this desk) after saving and changing files over some time. Disk defragmenting Disk defragmenter The software used to format a disk is called … File transfer / organiser You are probably familiar with Windows Explorer. There are other programs which you can download to view and/


Chapter 8 Operating Systems and Utility Programs.

has duplicate components such as processors, memory, and disk drives What are other program management features of operating systems? Click to view /formatting and copying disks creating shortcuts: an icon on the desktop that runs a program when you click it What are some file manager functions? Operating System Functions What is formatting?  The process of preparing a disk for reading and writing  Most floppy and hard disk manufacturers preformat their disks  Various operating systems format disks/


PowerPoint Presentation: Richard H. Baum, Ph.D. DeVry Institute of Technology 9th Edition Structured COBOL Programming Nancy Stern Hofstra University Robert.

. A key field that is the same as one already in the indexed file. Format: WRITE record-name-1 [FROM identifier-1] [INVALID KEY imperative-statement-1] Structured COBOL Programming, Stern & Stern, 9th Edition Updating an Indexed File Randomly As we have seen, one main feature of disk processing is that master records can be updated directly without having to create a new/


Liang,Introduction to Java Programming,revised by Dai-kaiyu 1 Chapter 4 Methods 条条大路通罗马.

to a boss (caller) asking a worker (called method) to complete a task Liang,Introduction to Java Programming,revised by Dai-kaiyu 5 Introducing Methods General format of method: Method can also return values: return expression ; Can’t define a method in another method /the last task involves moving n = 1 disk (i.e., the base case). This task is accomplished by simply moving the disk, without the need for a temporary holding area. Liang,Introduction to Java Programming,revised by Dai-kaiyu 78 Towers of Hanoi/


WEEK 6 DISKS FILE SYSTEM INTERFACE FILE SYSTEM IMPLEMENTATION Operating Systems CS3013 / CS502.

Blocks = Blocks per platter * platter  = cylinder * head * sector LBA Addressing 16 Linear Base Address (LBA) Addressing Logical Address for the disk Assume a disk with C cylinders, T tracks and S sectors and a CTS Address (c, t, s) LBA Address = c * T * S + / or may not know about this.) Its a tradeoff of power versus overhead. For example,  An Operating System understands program image format in order to create a process.  The UNIX shell understands how directory files look. (In general the UNIX kernel /


Windows Vista Inside Out Chapter 28 - Chapter 28 - Managing Disks and Drives Last modified 11-12-07.

all editions of Windows Vista Disk Management Tools  Disk Management console in Computer Management  Command- line program DISKPART New Features in Vista  Can now shrink partitions as well as expand them  support for writeable CDs and DVDs  Universal Disk Format (UDF) support for writeable CDs and DVDs  Dynamic disk for  Dynamic disk for USB or IEEE 1394 removable hard drives Disk Management Running Disk Management  At any command prompt/


Structured COBOL Programming, Stern & Stern, 9th Edition CHAPTER 2 Cobol Language Fundamentals.

do not have a COBOL Syntax Reference Guide, it can be downloaded from: http://www.wiley.com/cobol/ Structured COBOL Programming, Stern & Stern, 9th Edition OVERALL FORMAT A SELECT statement must be specified for each file in the program,. If a program requires a disk file as input and produces a printed report as an output file, two SELECT statements will be specified. –one file/


Chapter 11: Storage and File Structure. Overview of Physical Storage Media Magnetic Disks RAID Tertiary Storage Storage Access File Organization Organization.

cost of drives is very high Very slow access time in comparison to magnetic disks and optical disks – limited to sequential access. – Some formats (Accelis) provide faster seek (10s of seconds) at cost of lower capacity/, definition) Extra Slides Record Representation Records with fixed length fields are easy to represent – Similar to records (structs) in programming languages – Extensions to represent null values E.g. a bitmap indicating which attributes are null Variable length fields can be represented/


Chapter 4 Program Input and the Software Design Process.

does not store anywhere) leading white space characters as it reads your data from the input stream(either keyboard or disk file) SYNTAX These examples yield the same result. cin >> length; cin >> width; cin >> length >> /Set initial to middleName.substr(0, 1) + period Close files inData.close() outData.close() C++ Program //************************************************************* // Format Names program // This program reads in a social security number, a first name // a middle name or initial, and a/


Www.monash.edu.au FIT1001- Computer Systems Lecture 10 File Systems Features and Formats.

, in the case of multiple- user systems –Objectives: Palmer (but not limited to): >Partition and format disks to store and retrieve information >Enable files to be organized through directories and folders >Establish file naming conventions/ through Z: >Typically, C: is reserved for the first hard disk >Format Command –Writes the file system structure to the disk –Includes several additional switches that modify precise program operation –Switches: extra codes to change the way a particular command operates/


Storage and File Structure By Dr.K.K. Storage and File Structure Overview of Physical Storage Media Magnetic Disks File Organization RAID Tertiary Storage.

cost of drives is very high Very slow access time in comparison to magnetic disks and optical disks – limited to sequential access. – Some formats (Accelis) provide faster seek (10s of seconds) at cost of lower capacity/, definition) Extra Slides Record Representation Records with fixed length fields are easy to represent – Similar to records (structs) in programming languages – Extensions to represent null values E.g. a bitmap indicating which attributes are null Variable length fields can be represented/


SECONDARY STORAGE DEVICES

are not aware of the requirement for formatting The Floppy Disk preformatted Micro-floppy disk 2 -sided The Floppy Disk Formatting also creates a File Allocation Table (FAT) - a directory which stores the names of the files on the disk and their address. A FAT is necessary/were first used in the 1980s, the hard disk’s capacity was measured in MB. But modern data and programs take up much more space especially as they are now GUI based. The Hard Disk Hard disks are pretty reliable However as a standard they /


Disk Storage (E)CKD VS SAN

much earlier than 1992 the 3310 and the 3370 Greatly disliked by the system programming community who were used to CKD mostly because of the granularity of addressing all the blocks on the disk IBM responded to the Mainframe Systems Programmers’ moans and groans about FBA by …. …. discontinuing FBA format disks for the mainframe FBA was the future, but IBM’s customers (primarily the/


Disk fundamentals Old edition chapter 14. The virtual layering Virtual layering of disk storage system: 1.disk controller firmware – controller chips.

by virtually all existing operating systems for personal computers. This ubiquity makes it an ideal format for floppy disks and solid-state memory cards, and a convenient way of sharing data between disparate operating systems/ licensed commercially from Microsoft through their Intellectual Property Licensing program.MicrosoftFATMS-DOSHigh Performance File System metadata access control listsfile system journalingtrade secretIntellectual Property XP disk management tool Cluster sizes for 1.25-2gig volume /


File and Disk Maintenance

sectors in a cluster is determined by Size of the hard drive File allocation system – FAT, FAT32, NTFS, e When you format a disk the operating systems creates concentric recording bands, called tracks, around the circumference of the disk. Then, the formatting program (in our case Windows XP) subdivides each track into equal parts, called sectors. Although not all of them are shown in the/


Python Programming, 2/e1 Python Programming: An Introduction to Computer Science Chapter 5 Sequences: Strings, Lists, and Files.

expr to an integer value str( )Return a string representation of expr eval( )Evaluate string as an expression Python Programming, 2/e68 String Formatting String formatting is an easy way to get beautiful output! Change Counter Please enter the count of each coin type. Quarters: 6/ file are made to the copy stored in memory, not on the disk. Python Programming, 2/e85 File Processing Saving a word processing file The original file on the disk is reopened in a mode that will allow writing (this actually erases /


13. Secondary Storage (S&G, Ch. 13)

&G, Ch. 13) Operating Systems Certificate Program in Software Development CSE-TC and CSIM, AIT September--November, 2003 13. Secondary Storage (S&G, Ch. 13) Objectives introduce issues such as disk scheduling, formatting, and swap space management Contents 1. A Hard Disk (Again) 2. Disk Scheduling 3. Disk Formatting 4. Boot Blocks 5. Swap Space Management 6. Disk Reliability : 1. A Hard Disk (Again) Fig. 2.5, p.33/


Chapter 14: Disk Fundamentals. 2 Disk Storage Systems Tracks, Cylinders, and Sectors Disk Partitions (Volumes)

move read/write heads between tracks 5 Disk Formatting Physical formatting aka low-level formatting Usually done at the factory. Must be done before logical formatting Defines the tracks, sectors, and cylinders Logical formatting Permits disk to be accessed using sequentially numbered logical /signature (always 29h) Volume ID number (binary) Volume label File-system type (ASCII) Start of boot program and data 27 Keeping Track of Files MS-DOS Directory Structure Long Filenames in MS-Windows File Allocation /


A+ Guide to Software, 4e Chapter 6 Windows 9x/Me Commands and Startup Disk.

Creating a Windows 9x/Me Startup Disk Open the Control Panel Double-click the Add/Remove Programs icon Click Startup Disk tab and then click Create Disk Insert the Windows CD if it is requested –Windows then creates the startup disk Write protect and label the disk 23/26 A+ Guide to Software, 4e Using a Startup Disk to Partition and Format a New Drive Use Fdisk to/


Assembly Language for Intel-Based Computers, 4 th Edition Chapter 14: Disk Fundamentals (c) Pearson Education, 2002. All rights reserved. You may modify.

Intel-Based Computers, 2003. 6 Disk Formatting Physical formatting aka low-level formatting Usually done at the factory. Must be done before logical formatting Defines the tracks, sectors, and cylinders Logical formatting Permits disk to be accessed using sequentially numbered logical/ ExamplesExamples Irvine, Kip R. Assembly Language for Intel-Based Computers, 2003. 51 Your turn... Write a program that creates a hidden, read-only directory named __secret. Create a hidden file inside the new directory named/


Mass-Storage Structure

program from disk. The full bootstrap program is stored in a partition called the boot block, at a fixed location on the disk. A disk that has a boot partition is called a boot disk or system disk. MS-DOS disk layout Bad Blocks §14.3.3 Frequently, one or more sectors become defected... Bad blocks. They are handled differently: IDE controller: handled manually. When formatting, also scans the disk/


©Silberschatz, Korth and Sudarshan11.1Database System Concepts Chapter 11: Storage and File Structure Overview of Physical Storage Media Magnetic Disks.

Tapes are cheap, but cost of drives is very high Very slow access time in comparison to magnetic disks and optical disks  limited to sequential access.  Some formats (Accelis) provide faster seek (10s of seconds) at cost of lower capacity Used mainly for backup/ Each leaf page of the tree stores between half and 1 page worth of data from the object Special-purpose application programs outside the database are used to manipulate large objects:  Text data treated as a byte string manipulated by editors and /


I/O, Disks, and RAID.

starting sector and size of each partition High-level formatting Done for each partition Specifies boot block, free list, root directory, empty file system What happens on boot? BIOS loads MBR, boot program checks to see active partition Reads boot sector from that partition that then loads OS kernel, etc. Handling Errors A disk track with a bad sector Solutions: Substitute a spare/


Data Structures, Algorithms and Database Programming Semester 2/ Weeks 13-24 Database Programming Nick Rossiter/Emma-Jane Phillips- Tait.

in which SQL*Plus runs. Can see all their current settings through: show all; Cover appearance of prompts, formats on screen, transaction settings, recovery, escape, compatibility, … A potential pitfall for imported applications if different environment assumed/pages Data Structures, Algorithms and Database Programming Semester 2/ Week 22 Database Programming Nick Rossiter/Emma-Jane Phillips- Tait Hashing One of the big two Access Methods Very fast potentially –One disk access only in ideal situation Used /


1. Overview In this chapter, you will learn to Explain the partitions available in Windows Discuss the formatting options Partition and format a hard.

OS must locate bad sectors (if any). This mapping of bad sectors is one of the functions of high-level formatting. Floppy disks use FAT with 12 bits. 0000 FFF70001 00000002 0000………. 0000………. 0000FFFF FAT Limited 25 Using 16-bit FAT addresses a /the file name and the cluster’s number to the folder list File folder located in different cluster. What happen if program requesting that file? Fragmentation 35 Fragmentation occurs when files are spread across drives (not contiguous) Individual files are broken /


Tasks Necessary for Setting Up a Hard Disk Initializing the disk with basic or dynamic storage type Creating partitions on basic disks or volumes on dynamic.

with as little change as possible to existing FAT16 architecture, internal data structures, APIs, and on-disk format. Many internal and on-disk data structures and published APIs have been revised or expanded. FAT32 Partition Structure File System Limits The maximum/the fundamental unit of disk allocation. The default cluster size depends on the partition size. You can use the Disk Management snap-in to specify a cluster size up to 4 KB. If you use the Format.exe program to format an NTFS volume, /


UNIT 1.1 Introduction to Computer System. COM E 211: Basic Computer Programming UNIT 1.1 Introduction to Computer System Number System Computer Concepts.

B: Creating a file  Syntax: COPYCON target_file Display content of a text file  Syntax: TYPE target_file Delete file(s) from the disk  Syntax: DEL target_file Help on DOS command options, syntax format  Synatax: DOS_command/?  Example: DIR/?, COPY/? COM E 211: Basic Computer Programming Working with group of files  WILDCARD characters (* and ?), help select a group of files  Replaces the character with the name/


1 Chapter 5 : Input & Output I/O hardware (classification, device drivers) I/O hardware (classification, device drivers) I/O techniques (programmed, interrupt.

I/O techniques (programmed, interrupt driven, DMA) I/O techniques (programmed, interrupt driven, DMA) Structuring I/O software Structuring I/O software Disks (performance, arm scheduling, common disk errors) Disks (performance, arm scheduling, common disk errors) RAID configurations RAID/CRC) Re-formating may cure the error Re-formating may cure the error 37 Common Disk Errors (Cont.) Permanent checksum error (e.g., disk block physically damaged) Permanent checksum error (e.g., disk block physically damaged/


Disk Drives. Storage vs. Memory  Because ROM is read only and RAM is volatile, we need something else to save our work  This is storage Floppy disk.

/System Tools/ScanDisk.  Among other things, ScanDisk looks for platter defects and for lost clusters that are sometimes created when a program aborts. formatFormatting prepares a disk for reading and writing.  When you format a disk, the operating system erases all disk’s bookkeeping information tests the reliability of the sectors marks bad sectors (e.g. ones with scratches) creates a new table for bookkeeping information/


1 DOS 2 Directory structure of disks Directory structure of disks Full Path or Full file specification Full Path or Full file specification Creating directories.

is created AUTOMATICALLY when the disk is initialized or formatted. Formatting a disk is the ONLY way to create the ROOT directory. The ROOT directory is the first directory created. It is created AUTOMATICALLY when the disk is initialized or formatted. Formatting a disk is the ONLY way / name 10 MD - Examples Create a directory at the root of A called Programs A:>MD Programs Create a directory at the root of A called Programs A:>MD Programs Create a directory at the root of C called Myfiles A:>MD C:Myfiles /


COIT29222-Structured Programming Lecture Week 12  Reading: Textbook (4 th Ed.), Chapter 14 Textbook (6 th Ed.), Chapter 17 Study Guide Book 3, Module.

stream when data transfer complete Numeric data in sequential- access files – Example:  A disk file, in.dat, contains a set of integer value pairs. –A program is to read this file and generate a disk file, out.dat, consisting of the product of each pair of numbers. –The format of these disk files is shown below: Numeric data in sequential- access files – Example: Reading and/


1 CS11001: Programming & Data Structures Dept. of Computer Science & Engineering Prof. Bivas Mitra.

off Secondary storage is non-volatile  Disk Keep the program on the disk During execution  Load the program from the disk to memory Disk Memory CPU Program How does program run in a computer? 32 How does program run in a computer? Disk How does program run in a computer? Data area/ group for each variable in the list int a, b; float c; scanf(“%d %d %f”, &a, &b, &c); Format string Variable list (note the & before a variable name) 67  Commonly used conversion characters c for char type variable d for int /


Media Type: Sound Common File Formats:.WAV,.MID,.AU Description: Sound complements your titles with music, sound effects and voiceovers that create a mood,

: Balancing the need for sound quality with your available RAM and hard disk resourcesBalancing the need for sound quality with your available RAM and hard disk resources Setting proper recording levels to get a good, clean recordingSetting proper /=>Joint Photographic Experts Group(JPEG). Used by various drawing program and the Internet because it compresses bitmapped images into a smaller size Digital Image File Formats *.TIF => Tagged Image File Format. Introduced by Aldus and has many file versions. File/


T3-Memory. 3.2 Index Memory management concepts Basic Services Program loading in memory Dynamic memory HW support  To memory assignment  To address.

register with the address of the entry point instruction, which is defined in the executable file Basic services: program loading 3.18 STEP 1: Interpret executable format in disk If address translation is performed at runtime, which kind of address in in the executable file in disk? Logical or physical? Header in the executable file defines sections: type of section, size and position in/


1 ASAP Server Components Overview PROCESS NODE EXPAND DISK CPU & PCB APP SPOOLER TAPE TMF RDF MONITORCOLLECTOR LOG ASAP Server Components ASAP CI.

Continued  SET PARTITION [ | | FORMAT2 ] The has the following format: { | DEFAULT } { | BASE | ALL } [, ] is the name of the specific entity (e.g. CPU, DISK) to which the partitioning options apply. DEFAULT can be used in place / Process ON|OFF Enables/Disables Process availability information. Default ON.  Set Process object $System.System.Asappro defines the Process program object filename. Default $SYSTEM.SYSTEM.ASAPPRO  Set Process Param “Param, Param1” Process params: RATE defines the interval, in/


1 Chapter 4 Program Input and the Software Design Process.

does not store anywhere) leading white space characters as it reads your data from the input stream(either keyboard or disk file) 8 SYNTAX These examples yield the same result. cin >> length; cin >> width; cin >> length >>/initial to middleName.substr(0, 1) + period Close files inData.close() outData.close() 48 C++ Program //************************************************************* // Format Names program // This program reads in a social security number, a first name // a middle name or initial, and a /


Storing Data: Disks and Files Chapter: 9. Now Something Different Systems Oriented Course What is “Systems”? A: Not Programming Not programming big things..

9 Now Something Different Systems Oriented Course What is “Systems”? A: Not Programming Not programming big things.. Systems = Efficient and safe use of limited resources (e.g., disks) Efficient: resources should be shared, utilized as much as possible Safe: / i’th field done via arithmetic. Base address (B) L1L2 L3L4 F1F2 F3F4 Address = B+L1+L2 Record Formats: Variable Length Two alternative formats (# fields is fixed): * Second offers direct access to i’th field, efficient storage of nulls (special don’/


Assembly Language for Intel-Based Computers, 5 th Edition Chapter 14: Disk Fundamentals (c) Pearson Education, 2006-2007. All rights reserved. You may.

-Based Computers 5/e, 2007. 6 Disk Formatting Physical formatting aka low-level formatting Usually done at the factory. Must be done before logical formatting Defines the tracks, sectors, and cylinders Logical formatting Permits disk to be accessed using sequentially numbered logical sectors/ Irvine, Kip R. Assembly Language for Intel-Based Computers 5/e, 2007. 55 Your turn... Write a program that creates a hidden, read-only directory named __secret. Create a hidden file inside the new directory named $$/


Department of Computer Science Southern Illinois University Edwardsville Spring, 2008 Dr. Hiroshi Fujinoki FTP Protocol Programming.

PI Server DTP Disk FTP Server Commands Files “MDTM” FTP.ppt/001 File Updated Date “get” command (continued) MDTM Command File Size:“213 20001117031013” Date and time for last update CS 447 Network and Data Communication, Project Phase 2 CS 547/CS490 Advanced Network Programming “put” command Command Format: put put  Specify transmission file type = binary (TYPE command) FTP.ppt/001  Transfer the/


BIS 1753 Introduction to Computer Programming 1. Computer Program A set of instructions that enables a computer to process data Also called software Two.

in COBOL Start with asterisk (*) in column 7 (fixed format) Start with *> in column 1 (free format) Use as reminders and explanations of processing performed by program Use to describe program in IDENTIFICATION DIVISION Use to describe each paragraph in PROCEDURE /only a small portion used 152 Creating an Indexed File Records written in sequence by key field as for sequential disk file Once index file created, records can be accessed randomly 153 SELECT Statement ORGANIZATION INDEXED –Indicates index file /


15- 1 Chapter 15.  To familiarize you with ◦ Methods of disk file organization ◦ Random processing of disk files ◦ How to create, update, and access.

in sequence by key field ◦ Optional since SEQUENTIAL is default mode 15- 12  RECORD KEY clause ◦ Names key field within disk record used to form index ◦ Must be in same physical location in each record (usually first field) ◦ Value must be unique/key field equal to value stored in record key 15- 22 Format  Must run program to create indexed file ◦ Cannot be created using text editor  To test an update program, always run index file creation program first  May not be able to DISPLAY or print indexed /


Working with Datasets Part 1, non VSAM Topic Objectives Be able to: Explain what a data set is Describe data set naming conventions and record formats.

format (RECFM) system-managed storage (SMS) virtual storage access method (VSAM) volume table of contents (VTOC) What is a data set?  A data set is a collection of logically related data records stored on one disk storage volume or a set of volumes (and TAPE).  A data set can be: a source program/2, VSAM VSAM VSAM is Virtual Storage Access Method VSAM provides more complex functions than other disk access methods VSAM record formats:  Key Sequence Data Set (KSDS)  Entry Sequence Data Set (ESDS)  /


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