5. Gigabyte
A Gigabyte is equivalent to 1024 Megabytes although you will commonly see it referred to as 1,000 Megabytes (which isn't correct).
It can be written as GB or gbyte, but not Gb (used for gigabit).
1 Gigabyte could hold the contents of about 10 yards of books on a book shelf.
A DVD can store a Hollywood blockbuster film which would be around 4-8 gigabytes in size.
Hard disks are measured in gigabytes, with a typical hard disk size being around 160 gigabytes or more.
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Click on this link: Gigabyte