Computer Storage units
Size example
• 1 bit - answer to an yes/no question
• 1 byte - a number from 0 to 255.
• 90 bytes: enough to store a typical line of text from a book.
• 4 KB: about one page of text.
• 120 KB: the text of a typical pocket book.
• 3 MB - a three minute song (128k bitrate)
• 650-900 MB - an CD-ROM
• 1 GB -114 minutes of uncompressed CD-quality audio at 1.4 Mbit/s
• 8-16 GB - size of a normal flash drive
Speed measurement: The speed of Central Processing Unit (CPU) is measured by Hertz (Hz), Which represent a CPU cycle. The speed of CPU is known as Computer Speed.
CPU SPEED MEASURES
1 hertz or Hz
1 cycle per second
1 MHz
1 million cycles per second or 1000 Hz
1 GHz
1 billion cycles per second or 1000 MHz
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