# Units of storage in computer

### Understanding bits, bytes, and other units used in computer system

# what is a bit ?

A bit has only one of two values that is **0 or 1**, where electrical values of 0 stand for **off and 1 stand for on. It is a smallest unit of data on a system.It is binary digit.**

# what is a byte ?

**A byte is collection of 8 bits** . A byte store a single ASCII character.

An alphanumeric character lets says “A” is stored as 1 byte.

Example : To store the letter ‘R’ then it will store as ‘01010010’ which is 8 bits and 1 byte.

A **kilobyte (KB)** is equal to 1,024 bytes.

# bit vs byte

# How many bits in a byte?

# 1 byte 8 bits

There is 8 bits in one byte

# computer storage units smallest to largest

**Computer memory and storage used megabytes (MB) and gigabytes (GB).**

**1MB = 1,024 kilobytes, or 1,048,576 (1024×1024) bytes.**

** 1GB = 1,024 MB, or 1,073,741,824 (1024x1024x1024) bytes.**

** 1 Terabyte (TB) = 1,024 GB.**

** 1 Petabyte (PB) = 1,024 TB.**

** 1 Exabyte (EB) = 1,024 PB.**

** 1 Zettabyte (ZB) = 1,024 EB. **

** 1 Yottabyte (YB) = 1,024 ZB.**

Also there are **Hellabyte** or **Brontobyte.**

**some unit which is used in computer system**

1 kilobyte (KB) is equal to 1,024 bytes

1 megabyte (MB) is equal to 1,048,576 bytes

1 gigabyte (GB) is equal to 1,073,741,824 bytes

1 terabyte (TB) is equal to 1,099,511,627,776 bytes

1 petabyte (PB) is equal to 1,125,899,906,842,624 bytes

**Understanding difference between Mbps and MBps?**

Now understanding **uppercase B (B) and lowercase b (b)**.

**Uppercase B** is stands for **bytes** and** lowercase b** stands for **bits**.

**1MBps = 8Mbps**

**so 1Mbps=1/8*MBps**

*Example : 100 KB (kilobytes) = 800 Kb (kilobits).*

*Data SPEEDS are usually described in terms of BITS:*

*1,024 bits = 1 Kilobit*

*1,024Kb = 1 Megabit*

*1,024Mb = 1 Gigabit*

*1,024Gb = 1 Terabit*

**Mbps** means megabits per second, here **Mb** means upload and download speeds.

**MBps = Mega Bytes per second**

**Mbps = Mega bits per second**

*Example 100Mbps is only 12.5MBPS*

**Impotant Point to Remember :**

Generally, Internet service providers show in Mbps.

Example : Speed upto 16 Mbps

But,

While you download from internet, it is in MB/s or KB/s (Bytes).

In short, 16 Mbps plan, your maximum download speed will be 2 MB/s.

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