Difference between Software & Hardware
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Software
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Hardware
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1) Software is a set of instructions that tell a computer what to do.
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The physical parts of the computer are called
hardware.
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2)
Computer is useless with software.
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Software cannot run without hardware.
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3)
We cannot touch the software.
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We can touch the hardware.
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4) Hardware is useless
without software.
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Software is
useless without hardware.
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Explain the terms Bit, Byte, Word and Storage Units
Bit: abbreviation of binary digits (0 or 1), the smallest
unit of data storage. One bit occupies one storage location.
Byte: a group of combination of 8 bits is called a byte. One byte
can store one character.
Word: a complete word is a combination of one or more bytes
handled together as a single unit for processing and may thus be of 8, 16, 32
or 64 bits. The length of word varies from machine to machine but it
predetermined for each machine. A computer roads and processes all the bites of
the word at a time.
Storage units:
- Bit = 0, 1
- 1 nibble = 4 bits
- 8 bits = 1 bytes
- 1024 bytes = 1 kilobytes
- 1024 KB = 1 Megabytes
- 1024 MB = 1 Gigabytes
Measure of time and space
Millisecond:
- 1 thousand of a second
- Hard disk drive access the time often 10-20 millisecond.
Nanosecond:
- One billionth of a second
- Main memory access times are often 50-70 nanoseconds.
Micron (Micrometer):
- 1 millionth of a meter
- Circuits on computer chips are measured in microns.
Important Note:
- B demotes bytes
- b denotes bits (8 bits = 1 byte), so kb denotes kilobit (1 kilobit = 1024 bits or 1024/8 = 128 bytes)
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