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File Organization

Internal/External Memory Tecnologies

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Memory Hierarchy Technologies

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Memory Clusters

Internal ExternalElectronic Disks

3 Memory Hierarchies/Clusters

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Internal Memory

Core OthersMOS RAM/ROM

Internal Memory Cluster

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Core Memory (1)

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Core Memory (2)

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Core Memory (3)

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Core Memory (4)

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Core Memory (5)

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ROM/RAM Semiconductor Chips

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Electronic Disks

EBAM MBMCCD

Electronic Disks Cluster

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Charge Coupled Devices (CCD)

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Magnetic Bubble Memory (MBM)

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Magnetic Technologies

Drums DisksTapes

External Memory Cluster

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Structure of a Drum

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Fixed-Head Drum Storage

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Tapes

Tape Reels Fast TapesCassettes

Magnetic Tapes

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Tape Reels

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Tape Drive Layout

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Tape Drives

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Tapes Storage

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Cassettes

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Fast Tapes

Exabyte DLTDAT

Fast Tapes

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Examples of Fast Tapes

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Disks

Diskettes

Moving-headFixed-head

Magnetic Disks

Disk Pack

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Diskettes

8 inch 3 ½inch5 ¼inch

Diskettes

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Diskettes Layout

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Diskette Drives

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Diskette Terms

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Hard Disk Drives Evolution