This document discusses different techniques for data storage, retrieval, and playback of multimedia files. It describes various storage media like optical disks and hard drives that can be used to store multimedia. Retrieval of multimedia depends on whether the file is continuous or discrete media. There are different access techniques for retrieving data like sequential, direct, and index sequential access. Magnetic storage uses magnetization patterns to store data on mediums like hard disks or floppy disks. Optical disks like CDs and DVDs also store data that can be read with lasers. Disk spanning allows data to exceed storage capacities by spreading across multiple disks.

1. Data Storage & Retrieval Or Playback
Techniques Or Methods
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Multimedia System and Design

2. Data storage is a general term for archiving data in electromagnetic or other
forms for use by a computer or device. Different types of data storage play
different roles in a computing environment.
Data retrieval means obtaining data from a database management system
such as ODBMS. In this case, it is considered that data is represented in a
structured way, and there is no ambiguity in data. In order to retrieve the
desired data the user present a set of criteria by a query.
Data Storage & Retrival Or Playback
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3. Multimedia Storage
Multimedia can be stored in mediums such as Optical Disks, Hard Drives, Magnetic
Storage Media and such.
Multimedia Retrieval
• Multimedia retrieval depends on the type of multimedia file it is which may be
continuous or discrete.
• Continuous media is data where there is a timing relationship between source
and destination. Video, animation and audio are examples of continuous media.
• Some media is time independent or static or discrete media: normal data, text,
single images, graphics are examples.
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4. Types Of Storages
Magnetic Disk
Magnetic storage or magnetic recording is the storage of data on a magnetised
medium
Magnetic storage uses different patterns of magnetisation in a magnetisable
material to store data and is a form of non-volatile memory.
Types:
1. Hard Disk
2. Floppy Disk
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5. Types Of Storages
Optical Disk
Optical media - such as the compact disk (CD) - are storage media that hold
content in digital form and that are written and read by a laser; these media
include all the various CD and DVD variations, as well as optical jukeboxes and
auto changers.
Types:
1. CD R
2. CD Rw
3. VCD
4. DVD
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6. Disk Spanning
Disc spanning is a feature of CD and DVD burning software that
automatically spreads a large amount of data across many data discs if
the data set's size exceeds the storage capacity of an individual blank
disc.
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7. Retrieval, Playback Or Access Techniques
1) Sequential access Technique
2) Direct Access Technique
3) Index Sequential Technique
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8. Sequential access Technique
In computer science, sequential access means that a group of elements (such as
data in a memory array or a disk file or on magnetic tape data storage) is
accessed in a predetermined, ordered sequence. Sequential access is
sometimes the only way of accessing the data, for example if it is on a tape.
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9. Direct Access Technique
In computer storage, direct access is the ability to obtain data from
a storage device by going directly to where it is physically located on the device
rather than by having to sequentially look for the data at one physical location
after another.
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11. Index Sequential Access Technique
ISAM (Indexed Sequential Access Method) is a file management system
developed at IBM that allows records to be accessed either sequentially (in the
order they were entered) or randomly (with an index). Each index defines a
different ordering of the records.
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