Two main types of secondary storage devices Magnetic

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» Two main types of secondary storage devices: – Magnetic storage devices – Optical

» Two main types of secondary storage devices: – Magnetic storage devices – Optical storage devices Computer Studies Today 18 Chapter 1

Floppy Disks Computer Studies Today 18 Chapter 2

Floppy Disks Computer Studies Today 18 Chapter 2

» Data are organised on a floppy disk in rings called tracks. » Each

» Data are organised on a floppy disk in rings called tracks. » Each track is divided into sectors. Computer Studies Today 18 Chapter 3

» A floppy disk drive allows data to be read from or written to

» A floppy disk drive allows data to be read from or written to a floppy disk. Computer Studies Today 18 Chapter 4

Hard Disks A hard disk and a hard-disk drive Computer Studies Today 18 Chapter

Hard Disks A hard disk and a hard-disk drive Computer Studies Today 18 Chapter A disk pack 5

» The mechanism for reading or writing data on a hard disk is similar

» The mechanism for reading or writing data on a hard disk is similar to that of a floppy disk. » The hard disk consists of several metallic platters and the drive has several access arms. Computer Studies Today 18 Chapter 6

» The access arms move several read -write heads in and out between the

» The access arms move several read -write heads in and out between the hard disks. Computer Studies Today 18 Chapter 7

» A way to organise data on a disk pack is the cylinder method.

» A way to organise data on a disk pack is the cylinder method. Computer Studies Today 18 Chapter 8

» Materials that can cause a head crash. Computer Studies Today 18 Chapter 9

» Materials that can cause a head crash. Computer Studies Today 18 Chapter 9

» Hard disks have TWO advantages over floppy disks: – Hard disks provide larger

» Hard disks have TWO advantages over floppy disks: – Hard disks provide larger capacities than floppy disks. – The access time for a hard disk is shorter. Computer Studies Today 18 Chapter 10

» The access mode of magnetic disks (floppy disks and hard disks) is direct

» The access mode of magnetic disks (floppy disks and hard disks) is direct access. » Data are recorded on or retrieved from the disks randomly. Computer Studies Today 18 Chapter 11

Magnetic Tape A cartridge tape and a cartridge tape unit Computer Studies Today 18

Magnetic Tape A cartridge tape and a cartridge tape unit Computer Studies Today 18 Chapter 12

» Magnetic tape is the cheapest secondary storage medium and is suitable for storing

» Magnetic tape is the cheapest secondary storage medium and is suitable for storing a large amount of data. » Data are recorded on or retrieved from the tapes sequentially. Computer Studies Today 18 Chapter 13

Optical Disks Optical disks Computer Studies Today 18 Chapter A CD-ROM drive 14

Optical Disks Optical disks Computer Studies Today 18 Chapter A CD-ROM drive 14

» The access mode of optical disks is direct access. » The storage capacity

» The access mode of optical disks is direct access. » The storage capacity of optical disks is enormous and much larger than that of floppy disks. Computer Studies Today 18 Chapter 15

» Comparisons between floppy disks, hard disks, magnetic tapes and optical disks: Computer Studies

» Comparisons between floppy disks, hard disks, magnetic tapes and optical disks: Computer Studies Today 18 Chapter 16

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Storage Devices Magnetic Storage Optical Storage Digital StorageStorage Devices Magnetic Storage Optical Storage Digital Storage
Chapter No 4 Secondary Storage Devices Magnetic StorageChapter No 4 Secondary Storage Devices Magnetic Storage
Secondary Storage Management Hank Levy Secondary Storage SecondarySecondary Storage Management Hank Levy Secondary Storage Secondary
Secondary Storage Devices Ahijah Lane Secondary Storage DevisesSecondary Storage Devices Ahijah Lane Secondary Storage Devises
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Storage Devices Program Data Secondary Storage Primary StorageStorage Devices Program Data Secondary Storage Primary Storage
Storage Systems Types of Storage Devices magnetic disksStorage Systems Types of Storage Devices magnetic disks
Storage Devices Storage Store information Storage involve twoStorage Devices Storage Store information Storage involve two
Storage The two types of storage Primary StorageStorage The two types of storage Primary Storage
EXTERNAL STORAGE DEVICES Magnetic Tapes Magnetic tapes areEXTERNAL STORAGE DEVICES Magnetic Tapes Magnetic tapes are
Secondary Storage Devices Magnetic Disks Optical Disks FloppySecondary Storage Devices Magnetic Disks Optical Disks Floppy
Secondary Storage Devices Magnetic Tape Cassette Tape IfSecondary Storage Devices Magnetic Tape Cassette Tape If
Secondary Storage Devices Magnetic media Tape Disks OpticalSecondary Storage Devices Magnetic media Tape Disks Optical
Secondary Storage Devices Magnetic Disks CENG 351 FallSecondary Storage Devices Magnetic Disks CENG 351 Fall