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Data Storage 01
An ISBN number of a book would be a field in a library book database.

Data Storage 01

This KS3 ICT quiz is about data storage. Data storage is important to computers in many ways. The earliest form of data storage was to use cards with holes punched in them. These could then be fed into a computer when they were needed and the data could be processed. Some of the early computers even required cards to contain the instructions that told them what to do with the data. As computers developed, magnetic tape, like that used for tape recorders, was used to store both data and programs. Accessing data like this was slow and the tape reels had to be moved backwards and forwards over a 'head'. The head read the magnetic tape and was fixed in place.

The next development for data storage was to replace the reels of tape with magnetic disks. These were smaller than the tape reels and the data could be accessed faster as they were read by moving both the disk and the head. Hard disk drives are based on this system and are found in almost all computers. These are being replaced by data storage devices like USB flash drives and solid state drives (SSDs). These are faster and more resistant to damage than hard disk drives.

Data is held in files which .......
are arranged as exact copies of the data capture forms
contain data arranged randomly
contain data in organised structure
store pieces of data wherever a space can be found
If it wasn't organised, it would be very slow and difficult to get at the data in the file
A data file is divided into .......
Each record contains part of the data
A data file record is divided into .......
This is part of the organisation of data in a file
The fields in a record .......
all store the same data
all store the same type of data
are all the same size
store single items of data
The fields of a single record contain related data
Different fields in the same record .......
always contain the same data
always have the same length - fixed size
never contain duplicate data
usually have different lengths - variable size
The field is only as large as needed - saving memory
A collection of data held together in an organised way .......
is called a database
is called a databaste
is called a filing cabinet
is difficult to keep tidy
Even paper records can form a database
Which of these is not considered a database?
A box full of loose paper receipts
A name and address book listed alphabetically
The Electoral Roll
The Worldwide Web
Lots of data but no suggestion of organisation here
Databases store data in tables. Each row of a table.......
is a field
is a file
is a record
is an index
A table may store millions of records
Which would not be a field in a library book database?
Date book last issued
Date of purchase
ISBN number
Librarian's National Insurance number
The librarian's NI number is not relevant data
A single record in a data file .......
contains data about one object of interest
is the same as a database table
usually holds data about several objects of interest
will always contain a large number of fields
It would be confusing if each record held data that was not related
You can find more about this topic by visiting BBC Bitesize - Data and databases

Author:  Duncan Daish

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