{"id":728,"date":"2022-01-25T06:12:11","date_gmt":"2022-01-25T06:12:11","guid":{"rendered":"http:\/\/learnlearn.uk\/igcsecs\/?page_id=728"},"modified":"2022-01-26T08:36:16","modified_gmt":"2022-01-26T08:36:16","slug":"units-file-sizes","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/igcsecs\/units-file-sizes\/","title":{"rendered":"Units and file sizes"},"content":{"rendered":"
\n

File Sizes<\/h2>\n
\n\n

Talking about file sizes – BYTES<\/span><\/h3>\n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n
Bytes – File Sizes, Memory Sizes<\/strong><\/td>\n<\/tr>\n
Nibble<\/td>\n<\/td>\n4 bits<\/td>\n(Only need to know this for the exam)<\/td>\n<\/tr>\n
Byte<\/td>\nB<\/td>\n8 bits<\/td>\n<\/td>\n<\/tr>\n
Kilobyte<\/td>\nKB<\/td>\n1000 Bytes<\/td>\n<\/td>\n<\/tr>\n
Megabyte<\/td>\nMB<\/td>\n1000 Kilobytes<\/td>\n1,000,000 Bytes<\/td>\n<\/tr>\n
Gigabyte<\/td>\nGB<\/td>\n1000 Megabytes<\/td>\n1,000,000,000 Bytes<\/td>\n<\/tr>\n
Terabyte<\/td>\nTB<\/td>\n1000 Terabytes<\/td>\n1,000,000,000,000 Bytes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

When we are talking about file sizes we usually use Bytes as our basic unit.<\/p>\n

For a example:<\/p>\n

    \n
  • A text file is 25KB<\/li>\n
  • A photo is 4.5MB<\/li>\n
  • A computer game is 234GB<\/li>\n<\/ul>\n

    We use the same metric system as in normal maths – kilo, mega, giga, etc with each being 1000 times large than the previous one.<\/p>\n

    If you converting from one unit of bytes to the next you just either times by 1000 or divide by 1000.<\/p>\n

    Example:<\/p>\n

      \n
    • 2MB = 2,000KB = 2,000,000 Bytes<\/li>\n
    • 1,450MB = 1.45GB<\/li>\n<\/ul>\n\n<\/div>

      Networking Speeds<\/h2>\n
      \n\n

      Talking about network speeds \/ download speeds – BITS<\/span><\/h3>\n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n
      Bits – Network \/ Data Transfer Speeds<\/strong><\/td>\n<\/tr>\n
      bit<\/td>\nb<\/td>\n1 bit<\/td>\n<\/td>\n<\/tr>\n
      Kilobit<\/td>\nKb<\/td>\n1000 Bits<\/td>\n<\/td>\n<\/tr>\n
      Megabit<\/td>\nMb<\/td>\n1000 Kilobits<\/td>\n1,000,000 bits<\/td>\n<\/tr>\n
      Gigabit<\/td>\nGb<\/td>\n1000 Megabits<\/td>\n1,000,000,000 bits<\/td>\n<\/tr>\n
      Terabit<\/td>\nTb<\/td>\n1000 Gigabits<\/td>\n1,000,000,000,000 bits<\/td>\n<\/tr>\n
      <\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      Usually expressed as a speed<\/td>\n<\/tr>\n
      E.g. 20Mb\/s – 20 Megabits per second transfer speed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Most manufacturers talk about transmission speeds using bits not bytes<\/strong><\/p>\n\n<\/div>

      Conversions<\/h2>\n
      \n\n

      Converting from bits to bytes<\/strong><\/p>\n

      If you want to convert from bits to bytes, you simply divide the number of bits by 8<\/strong><\/p>\n

      64 bits = 8 bytes<\/p>\n

       <\/p>\n

      Converting from bytes to bits<\/strong><\/p>\n

      To convert from bytes to bits you simply multiply the number of bytes by 8<\/strong><\/p>\n

      2,000 Bytes\u00a0 = 16,000 Bits<\/p>\n\n<\/div>

      Crossword<\/h2>\n
      \n\n
      <\/div><\/div><\/div>
      \r\n \r\n
      1. 1000 Bytes<\/div>\r\n <\/div>
      \r\n \r\n
      2. 1,000,000 Bits<\/div>\r\n <\/div>
      \r\n \r\n
      3. 1,000,000 Kilobits<\/div>\r\n <\/div>
      \r\n \r\n
      4. 1,000,000 Kilobytes<\/div>\r\n <\/div>
      \r\n \r\n
      5. Used for storage and memory<\/div>\r\n <\/div>
      \r\n \r\n
      6. Used for transmission speeds<\/div>\r\n <\/div>
      \r\n \r\n
      7. Most appropriate unit for a smartphone photo<\/div>\r\n <\/div>
      \r\n \r\n
      8. 1000 bits<\/div>\r\n <\/div>
      \r\n \r\n
      9. 4 bits<\/div>\r\n <\/div><\/div><\/div>
      <\/div>