Transcript Use of Storage Requirements, media and devices

Use of Storage Requirements,
media and devices
AQA INFO 1
Section 5
TC@TGSG based on material from
Mott,Leeming,Williams
Why data is stored
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Data is likely to be used again and re-entering
is time consuming
Storage media is transferable
Data can be backed up
Data can be archived
TC@TGSG based on material from
Mott,Leeming,Williams
Hard Disk
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Magnetic storage device
Location: CPU
Stores the operating system/software and
other files
Can manage file structure;
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Makes it easier to locate files
TC@TGSG based on material from
Mott,Leeming,Williams
Floppy Disk
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For many years was essential [A: drive]
Now it is becoming obsolete due to small
storage size and data transfer is slow.
TC@TGSG based on material from
Mott,Leeming,Williams
CD-ROMs
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[Compact Disk-Read Only Memory]
Portable
Store larger quantities of data [750mb]
Less prone to damage > laser not magnetic
Data can be read but not written to/edited or
saved.
TC@TGSG based on material from
Mott,Leeming,Williams
CD R
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[Compact disk – Recordable]
Writable compact disks
Data cannot be altered once recorded on
Suitable for archiving data
Suitable for multimedia
TC@TGSG based on material from
Mott,Leeming,Williams
CD RW
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[Compact disk – Rewritable]
Rewriteable compact disks
Data can be recorded/deleted and edited
Suitable for multimedia
TC@TGSG based on material from
Mott,Leeming,Williams
DVD
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[Digital Versatile Disk]
High capacity optical disk
Can store large amounts of data [up to 17GB]
Used for films and audios
TC@TGSG based on material from
Mott,Leeming,Williams
Flash Memory
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[USB Memory Stick]
Removable backing storage
Uses flash memory i.e. User plugs it in and
uses it
Is small and light
High capacities [up to 7 GB]
Often used for graphical images and musical
files
TC@TGSG based on material from
Mott,Leeming,Williams
Summary
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Storage devices can be fixed/removable
Used for increasing capacity/backup/archiving
Hard disk = high capacity & permanent
Floppy Disk = low capacity & portable
Flash media = high capacity & portable
CD ROM = medium capacity & read only
CD R & CD RW = High capacity & rewritable
DVD = read only & Very high capacity
TC@TGSG based on material from
Mott,Leeming,Williams
website
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http://www.teachict.com/as_a2_ict_new/ocr/AS_G061/312_sof
tware_hardware/storage_devices/miniweb/ind
ex.htm
TC@TGSG based on material from
Mott,Leeming,Williams