How does the os provide access to storage resources. Learn vocabulary, terms, and more with flashcards, games, and other study tools. It is a comprehensive computer storage system that is usually very slow, so it is usually used to archive data that is not accessed frequently. Solid state disks have the same characteristics as traditional hard disks.
Hence, knowing the structure of a magnetic disk is necessary to understand how the data in the disk is accessed by the computer. Overview of mass storage structure magnetic disks provide bulk of secondary storage drives rotate at 70 to 250 times per second ipod disks. Chapter 10 massstorage structure flashcards quizlet. Every massstorage device contains a microcontroller, microprocessor, or. Nonbuilding structures comprise a myriad of structures constructed of all types of materials with markedly different dynamic characteristics and a wide range of performance requirements. Objectives describe the physical structure of secondary and tertiary storage devices and the resulting effects on the uses of the devicesand the resulting effects on the uses of the devices explain the performance characteristics of mass storage devices discuss operatingsystem services provided for mass storage, including raid and hsm operating system concepts 8 th edition 12. Marvin minsky throughout the course we will use overheads that were adapted from those distributed from the textbook website. Overview of mass storage structure magnetic disks provide bulk of secondary storage of modern computers drives rotate at 60 to 250 times per second transfer rate is rate at which data.
Operating system notes pdf os pdf notes free sw 2020. Modern mass storage devices include all types of disk drives and tape drives. Storage devices tertiary storage typically it involves a robotic mechanism which will mount insert and dismount removable mass storage media into a storage device. Data on a harddrive is often arranged into files by the operating system. Freeplacement administration complex objects memorybased record addressing mapping of. Chapter 12 mass storage systems linkedin slideshare. Overview of mass storage structure magnetic disks provide bulk of secondary storage of modern computers zdrives rotate at 60 to 200 times per second ztransfer rate is rate at which data flow between drive and computer zpositioning time randomaccess time is time to move disk arm to desired. Mass storage devices used in desktop and most server computers typically have their data organized in a file system.
Universal serial bus mass storage specification for bootability revision 1. Data plus some redundant information is striped across the disks in some way. Chapter 10 massstorage structure operating system concepts. This storage is typically very small, ultrafast, and volatile. Hard disk platters are made of rigid metal, while floppy disks are made of more flexible plastic. In chapter 11, we examine the user and programmer interface to the. Particular devices, such as hddsandnvm devices, are specifiedasappropriate. To describe the physical structure of secondary storage devices and its effects on the uses of the devices. Mass storage systems adapted from textbook slides figure 11. Mass storage mode is a feature on android smartphones and blackberrys that enables devices as a removable drive when connected to a computer. Overview of mass storage structure surendar chandra.
Slides are from the book authors, modified and selected by jean mayo, shuai wang and ck shene. Conceptually, disks are relatively simple figure 12. The choice of file system is often important in maximizing the performance of the device. In chapter 11, we examine the user and programmer interface to the file system. Despite the different technologies, theres tremendous commonality as. Mass storage basics a mass storage device is electronic hardware that stores information and supports a protocol for sending and retrieving the information over a hardware interface. Price per megabyte of dram, from 1981 to 2004 mass storage structure price per megabyte of hard disk, from 1981 to 2004 is it only about price where. Fsector 0 is the first sector of the first track on the outermost cylinder.
Nonbuilding structure design 3 chapter 15 of the standard is devoted to nonbuilding structures. Devices with dedicated functionsdata loggers, robots, and other embedded systemscan use mass storage as well. Structure in this section we present a general overview of the physical structure of secondary and tertiary storage devices. Magnetic tape was early secondary storage medium relatively permanent and holds large quantities of data access time slow random access times slower than disk mainly used for backup, storage of infrequentlyused data, transfer medium between systems. Secondary storage devices are used to store data for future use or as backup. In chapter 11, we describe the internal data structures and algorithms used by the operating system to implement this interface. Operating systems 3 chapter 12 mass storage structure. Io systems 8 disk attachment storagearea network common in large storage environments and becoming more common multiple hosts attached to multiple storage arrays flexible massstorage structure. Apr 20, 2009 overview of mass storage structure disk structure disk attachment disk scheduling disk management swapspace management raid structure disk attachment stables slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Io systems 11 raid raid 10 becoming more and more popular.
Every usb massstorage device must support two interfaces. Designing and programming a usb massstorage device or embedded usb host involves a variety of interfaces, protocols, and structures. Mass chapter12 storage structure practice exercises 12. The data is arranged within a file in blocks, and the position. How does the physical design of storage devices affect the software design and performance of the os. Operating system concepts essentials 8th edition 11. A computers hard drive is a massstorage device, as are flash, cd, and dvd drives. Use of the material is authorized for personal use, and for use in conjunction with a course for which operating system concepts is the prescribed text. Mar 07, 2017 describe the physical structure of secondary and tertiary storage devices and the resulting effects on the uses of the devices explain the performance characteristics of mass storage devices discuss operatingsystem services provided for mass storage, including raid and hsm 4. Magnetic disks provide the bulk of secondary storage for modern computer systems. Mass storage structure materi overview of mass storage structure disk structure disk attachment disk. Abraham silberschatz, greg gagne, and peter baer galvin, operating system concepts, eighth edition, chapter 12 12. A usb device interface to enable the device to communicate with a pc or other usb host.
Usually incorporate tertiary storage by extending the file system. It is a comprehensive computer storage system that is usually very slow, so it is usually used. Disk structure n disk drives are addressed as large 1dimensional arrays of logical blocks, where the logical block is the smallest unit of transfer. The file system can be viewed logically as consisting of three parts. Hostattached storage communication techniques ide, ata. Msds are portable storage media that provide a storage interface that can be both internal and external to the computer. Universal serial bus mass storage specification for bootability. In modern computers, most of the secondary storage is in the form of magnetic disks. Mass chapter9 storage structure practice exercises 9. In particular, design separate classes that implement the following scheduling algorithms. In order to use mass storage, the mode must first be. Bulk of secondary storage for modern computers is hard disk drives. Pdf mass storage structure shivashekharayya viraktamath.
Massstorage systems overview of mass storage structure disk structure disk attachment disk scheduling disk management swapspace management raid structure stable storage implementation operating system concepts 10th edition 11. Chapter 12 mass storage structure operating system. Mass storage disk drives and solidstate drives store the operating system and applications. Raid structure a raid is a redundant array of independent disks.
A mass storage device msd is any storage device that makes it possible to store and port large amounts of data across computers, servers and within an it environment. Mass storage is distinct from memory, which refers to temporary storage areas within the computer. To use a disk to hold files, the operating system still needs to record its own data structures on the. Massstorage structure this covers a retired java programming problem. Describe the physical structure of secondary and tertiary storage devices and the resulting effects on the uses of the devicesand the resulting effects on the uses of the devices explain the performance characteristics of mass storage devices discuss operatingsystem services provided for mass storage, including raid and hsm. Traditional magnetic disks have the following basic structure. Mass storage structure spring 2019 you dont understand anything until you learn it more than one way. Storage to maintain the quality of grain after harvest for maintaining the supply of grain taking advantage of higher prices two methods of grain storage bag storage loose in bulk storage the choice based on the local factors type of grain duration of. In this chapter, we begin a discussion of file systems at the lowest level.
Any use that differs from the above, and any for profit sale of the maual in any form requires the consent of the owners. Magnetic tape was early secondary storage medium relatively permanent and holds large quantities of data access time slow random access times slower than disk mainly used for backup, storage of infrequentlyused data, transfer. In this section we present a general overview of the physical structure of secondary and tertiary storage devices. Secondary storage and disk scheduling algorithms studytonight. Secondary storage includes memory devices that are. To explain the performance characteristics of mass storage devices to evaluate disk scheduling algorithms to discuss operatingsystem services provided for mass storage, including raid 12. Disks are small and cheap, so its easy to put lots of disks in one box for increased storage, performance, and availability. The earliest storage devices were punched paper cards, which were used as early as 1804 to control silkweaving looms. To describe the physical structure of secondary storage devices and its effects on the uses of the devices to explain the performance characteristics of mass storage devices to evaluate disk scheduling algorithms to discuss operatingsystem services provided for mass storage, including raid. Start studying operating systems 3 chapter 12 mass storage structure. Cmos silicon structure and high speed, low power consumption. Secondary storage refers to fixeddisk storage systems hard drives.
Mass storage structure this covers a retired java programming problem. Primary storage requires continuous power supply in order to maintain its state. The information can be anything that can be stored electronically. And tertiary storage refers to removable media, such as tape drives, cds, dvds, and to a lesser extend floppies, thumb drives, and other detachable devices. In chapter 10, we examine the user and programmer interface to the. Mass storage systems n disk structure n disk scheduling n disk management n swapspace management n raid structure n disk attachment n stable storage implementation n tertiary storage devices n operating system issues n performance issues. Overview of mass storage structure cont magnetic tape zwas early secondary storage medium zrelatively permanent and holds large quantities of data zaccess time slow zrandom access times slower than disk zmainly used for backup, storage of infrequentlyused data, transfer medium between systems. In chapter 12, we describe the internal data structures and algorithms used by the operating system to implement this interface.
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