# Convert mb to gb

The size of information in the computer is measured in kilobytes, megabytes, gigabytes, and terabytes. In this section, we"ll look at common sizes you would see in real life and learn how to reason about various numbers of bytes.

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## Kilobyte or KB

Kilobyte KB - about 1 thousvà bytesAs we know, 1 byte is one typed character - see below for why the phrase "about 1 thousand" is required hereAn tin nhắn without images is about 2 KBA five sầu page paper might be 100 KBText is compact, requiring few bytes compared khổng lồ images or sound or videoe.g. 23,000 bytes is about 23 KBOne kilobyte (KB) is a collection of about 1000 bytes. A page of ordinary Roman alphabetic text takes about 2 kilobytes to lớn store (about one byte per letter). A typical short gmail would also take up just 1 or 2 kilobytes. Text is one of the most naturally compact types of data at about one byte required to lớn store each letter. In non-roman alphabets, such as Mandarin, the storage takes up 2 or 4 bytes per "letter" which is still pretty compact compared to lớn audio & images.

## Megabyte or MB

Megabyte (MB) - about 1 million bytesaka about 1000 KBMP3 audio is about 1 megabyte per minuteA high quality digital picture is about 2-5 megabytese.g. 45,400 KB is 45.4 MBOne megabyte is about 1 million bytes (or about 1000 kilobytes). An MP3 audio file of a few minutes or a 10 million pixel image from a digital camera would typically take up few megabytes. The rule of thumb for MP3 audio is that 1 minute of audio takes up about 1 megabyte. Audio and image and video clip data typically stored in "compressed" size, MP3 being an example. We"ll talk about how compression works later. A data CD disk stores about 700 MB. The audio on a CD is not compressed, which is why it takes so much more space than the MP3. The series of bits are represented as spiral path of tiny pits in the silver material in the disk. Imagine that each pit is interpreted as a 0, and the laông xã of a pit is a 1 as the spiral sequence is read. Fun fact: the whole spiral on a CD is over 5km long.

## Math - You Try It

2,000,000 bytes is about how many MB?

## Gigabyte or GB

Gigabyte GB = about a billion bytesaka about 1000 MBGB is a comtháng unit for modern hardwaree.g. 4000 MB = 4 GBAn ordinary computer might have: -4 GB or RAM -256 GB of persistent storageA DVD disk has a capađô thị 4.7GB (single layer)-Figure 2 GB per hour of đoạn Clip (varies greatly)A flash drive sầu might hold 32 GBA hard drive sầu might hold 750 GBOne gigabyte (GB) is about 1 billion bytes, or 1 thousand megabytes. A computer might have sầu 4 GB of RAM. A flash memory card used in a camera might store 16 GB. A DVD movie is roughly 4-8 GB.Math - You Try ItHow many GB is 4,000,000,000 bytes?

## Terabyte or TB

One terabyte (TB) is about 1000 gigabytes, or roughly 1 trillion bytes. You can buy 4 TB hard drives today, so we are beginning the time when this term comes in to common use. Gigabyte used to be an exotic term too, until Moore"s law made it common.

## Gigahertz - Speed, not Bytes

One gigahertz is 1 billion cycles per second (a megahertz is a million cycles per second). Gigahertz is a measure of speed, very roughly the rate that at a CPU can bởi vì its simplest operation per second. Gigahertz does not precisely tell you how quickly a CPU gets work done, but it is roughly correlated. Higher gigahertz CPUs also tkết thúc khổng lồ be more expensive to produce và they use more power (& as a result give off more heat) - a challenge for putting fast CPUs in small devices lượt thích phones. The ARM company is famous for producing chips that are very productive with minimal power và heat. Almost all cell phones currently use ARM CPUs.

## Kilobyte / Megabyte / Gigabyte Word Problems

You should be comfortable doing simple arithmetic to lớn figure MB / GB sizes, just as you should be able khổng lồ vày basic computations with second, miles, kilos and so forth.Basic plan: before adding measures X & Y, convert them khổng lồ be in the same units.Word ProblemsSolution
Alice has 600 MB of data. Bob has 2000 MB of data. Will it all fit on Alice"s 4 GB thumb drive?show
Yes it fits: 600 MB + 2000 MB is 2600 MB. 2600 MB is 2.6 GB, so it will fit on the 4 GB drive sầu no problem. Equivalently we could say that the 4 GB drive has space for 4000 MB.
Alice has 100 small images, each of which is 500 KB. How much space bởi they take up overall in MB?show
Your ghost hunting group is recording the sound inside a haunted hocbong2016.net classroom for 20 hours as MP3 audio files. About how much data will that be, expressed in GB?show
MP3 audio takes up about 1 MB per minute. đôi mươi hours, 60 minutes/hour, trăng tròn * 60 yields 1200 minutes. So that"s about 1200 MB, which is 1.2 GB.

## Alternate Terminology: Kibibyte Mebibyte Gibibyte Tebibyte

It"s convenient within the computer khổng lồ organize things in groups of powers of 2. For example, 210 is 1024, and so a program might group 1024 items together, as a sort of "round" number of things within the computer. The term "kilobyte" above refers to this group kích thước of 1024 things. However, people also group things by thousands -- 1 thous& or 1 million items.There"s this problem with the word "megabyte": does it mean 1024 * 1024 bytes, i.e. 220, which is 1,048,576, or does it mean exactly 1 million, 1000 * 1000. It"s just a 5% difference, but marketers tkết thúc to prefer the 1 million interpretation, since it makes their hard drives etc. appear khổng lồ hold a little bit more. Also, the difference grows larger and larger for the gigabyte và terabyte sizes. In an attempt lớn fix this, the terms "kibibyte" "mebibyte" "gibibyte" "tebibyte" have sầu been introduced lớn specifically mean the 1024 based units (see the Wikipedia article on kibibytes). These terms vì chưng not seem lớn have caught on very strongly thus far. If nothing else, remember that terms like "megabyte" have sầu this little wiggle room in them between the 1024 và 1000 based meanings. We will never grade off for this distinction. "About a million" will be our close-enough interpretation for "megabyte".