Bits and Bytes Key Revision Points.

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Presentation transcript:

Bits and Bytes Key Revision Points

Bits Smallest unit of storage 1 bit Can store either 1 or 0 only – used to represent an electrical signal being on/off To store anything meaningful need to be combined in larger units

Bytes Bits in modern computer grouped together in blocks of 8 (for historical reasons) 1 Byte = 8 Bits 1 Byte – any combination of eight 1s or 0s 00000000 – 11111111 256 possible combinations (2 to the power of 8)

Nibble Half a byte – geek humour! 1 Nibble = 4 bits 0000-1111

Larger Units (in size order) Bit Nibble Byte Kilobyte – exactly 1024 bytes (approx. 1 thousand bytes) Megabyte – exactly 1048576 bytes (approx. 1 million bytes or 1000 Kilobytes) Gigabyte –exactly 1073741824 bytes (approx. 1 billion bytes or 1000 Megabytes) Terabyte – exactly 1099511627776 (approx. 1 trillion bytes or 1000 Gigabytes)