Some terms:

 

Some common abbreviations:

  • adn - Any day now
  • afaik - As far as I know
  • afk - Away from keyboard
  • asap - As soon as possible
  • bbiab - Be back in a bit
  • bbiaf - Be back in a few
  • bf - Boyfriend
  • brb - Be right back
  • cul8r - See you later
  • faq - Frequently asked questions
  • fud - Fear, uncertainty and doubt
  • fwiw - For what it's worth
  • fyi - For your information
  • gf - Girlfriend
  • hand - Have a nice day
  • ianal - I am not a lawyer
  • idk - I don't know
  • iirc - If I remember correctly
  • imho - In my humble opinion
  • lol - Laugh out loud
  • np - No problem
  • omg - Oh my gosh
  • otoh - On the other hand
  • pita - Pain in the arm
  • roflmao - Rolling on the floor, laughing my arm off
  • rtfm - Read the fine manual
  • thx  - Thanks
  • tia - Thanks in advance
  • ttyl - Talk to you later
  • wysiwyg - What you see is what you get
  • ymmv - Your mileage may vary

Sizes and speeds:

Sizes - each entry on a row is the same size
          1 bit
        1 byte 8 bits
      1 kilobyte 1024 bytes 8,192 bits
    1 megabyte 1024 kilobytes 1,048,576 bytes 8,388,608 bits
  1 gigabyte 1024 megabytes 1,048,576 kilobytes 1,073,741,824 bytes 8,589,934,592 bits
1 terabyte 1024 gigabytes 1,048,576 megabytes 1,073,741,824 kilobytes 1,099,511,627,776 bytes 8,796,093,022,208 bits

   Seems pretty straightforward, right? Well, there's one problem. The prefixes "kilo", "mega" and "giga" are borrowed from the metric system, where they mean one thousand, one million and one billion. So the hard-drive manufacturers have decided to use those numbers, since it makes their drives seem bigger. To them, the table looks like this:

Sizes - each entry on a row is the same size
          1 bit
        1 byte 8 bits
      1 kilobyte 1000 bytes 8,000 bits
    1 megabyte 1000 kilobytes 1,000,000 bytes 8,000,000 bits
  1 gigabyte 1000 megabytes 1,000,000 kilobytes 1,000,000,000 bytes 8,000,000,000 bits
1 terabyte 1000 gigabytes 1,000,000 megabytes 1,000,000,000 kilobytes 1,000,000,000,000 bytes 8,000,000,000,000 bits

   It's a lot simpler, but there's a difference of 73,741,824 bytes for every gigabyte. That's why, when you bring home a 250 gigabyte hard drive, Windows shows only 232 gigabytes. It's not that 18 gigabytes are wasted...they're not there! When abbreviating sizes, a lower-case "b" is used for "bits", and an upper-case "B" is used for "bytes". So kilobytes would be "KB", megabytes "MB" and gigabytes "GB".


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