Bits, Bytes, KiloBytes, MegaBytes, GigaBytes

1
Bits, Bytes, KiloBytes, MegaBytes, GigaBytes
TeraBytes.
2
Bit

• 0 or 1

3
Byte

• Equivalent to 8 bits

4
KiloByte

• 2 10 Bytes (approx. a thousand)
• K - Thousand 103

5
MegaByte

• 2 20 Bytes (approx. a million)
• M - Million 106

6
GigaByte

• 2 30 Bytes (approx. a billion)
• G - Billion 109

7
TeraByte

• 2 40 Bytes (approx. a trillion)
• T - Trillion 1012

8
Decimal (compare to binary)

• 451 410 2 510 1 110 0
• 4037 410 3 010 2 310 1 710 0
• 52305 510 4 210 3 310 2 010 1 510
  0

9
Binary

• 10011 124 023022121120
• 16 0 0 2 1
• 19 (in base 10)
• 101101 125 024 123122021120
• 32 0 8 4 0 1
• 45 (in base 10)
• 1101 ?

10
One character is represented using one byte (8
bits)
11
ASCII

• American Standard Code for Information
  Interchange
• The ASCII character code for the letter A is
• 65 0100 0001
• The ASCII character code for the letter B is
• 66 0100 0010
• etc.

12
ASCII (continued)

• The ASCII character code for a space (pressing
  the space bar) is
• 32 0010 0000
• The ASCII character code for the letter a is
• 97 0110 0001
• The ASCII character code for the letter b is
• 98 0110 0010
• etc.

13
Base 16

• Base two - digits run from 0 to 1
• Base ten - digits run from 0 to 9
• Base sixteen - digits run from 0 to 15
• The digits are
• 0 1 2 3 4 5 6 7 8 9 A B C D E F

14
Hexadecimal to Decimal

• 8 D 816 1 D16 0
• 816 1 1316 0 141
• D 8 D16 1 816 0
• 1316 1 816 0 216
• 3 E 316 1 E16 0
• 316 1 1416 0 62

15
Decimal to Hexadecimal
125 in base 16 is
7D
167 112 and 125-112 13.
Therefore, there is a remainder of 13 (or D).
16
Decimal to Hexadecimal
191 in base 16 is
BF
1611 176 and 191-176 15.
Therefore, there is a remainder of 15 (or F).