GCSE COMPUTER SCIENCE Topic 3 - Data 3.8 Data Storage

Speed Units Speed units are needed to measure how fast processors are. Example A 1GHz processor can compute 1 billion instructions a second. The faster a CPU is, the more computations it can perform a second.

The base unit of speed is called a: Speed Units The base unit of speed is called a: Hertz

The next unit of speed is: Speed Units The next unit of speed is: Kilohertz 1 Kilohertz is 1024 Hertz

Megahertz Speed Speed Units The next unit of speed is: 1 Megahertz is 1024 Kilohertz

Gigahertz Speed Speed Units The final unit of speed is: 1 Gigahertz is 1024 Megahertz

Storage Units Storage units are needed measure how much data a device can hold. Example A 1GB USB stick can hold roughly 230 mp3s, 16 hours of music or 20 music albums. Not enough to hold a movie. The larger a storage device is, the more data is can hold.

Half a byte (4 bits) is called a nibble Storage Storage Units The base unit of storage is called a: Byte There are 8 bits in a byte Half a byte (4 bits) is called a nibble

The next unit of storage is: Storage Units The next unit of storage is: Kilobytes 1 Kilobytes is 1024 Bytes

The next unit of storage is: Storage Units The next unit of storage is: Megabytes 1 Megabyte is 1024 Kilobytes

The next unit of storage is: Storage Units The next unit of storage is: Gigabytes 1 Gigabyte is 1024 Megabytes

The final unit of storage is: Storage Units The final unit of storage is: Terabytes 1 Terabyte is 1024 Gigabytes

You need to remember these, especially the order. Speed & Storage Units: Recap Speed Units Hertz (Hz) Storage Units bit (b) Hertz Kilohertz (KHz) Bytes Byte (B) Megahertz (MHz) Kilobyte (KB) Gigahertz(GHz) Megabyte (MB) Gigabyte (GB) Terabyte (TB) You need to remember these, especially the order. ACTIVITY Write these down in your books under a title of speed and storage units

Convert the following values into Bytes: Storage Unit Conversions Convert the following values into Bytes: Value Bytes 100 Nibbles 50 1 Kilobyte 1024 150 Kilobytes 150 * 1024 1 Megabyte 1024 * 1024 10 Megabytes 10 * (1024 * 1024) 5 Gigabytes 5 * (1024 * 1024* 1024) 2 Terabytes 2* (1024 * 1024 * 1024* 1024)

Which of the following is the largest? Storage Units: Quiz Which of the following is the largest? 1/5 100 Kilobytes or 100 Megabytes 100 Megabytes

Which of the following is the largest? Storage Units: Quiz Which of the following is the largest? 2/5 1000 Bytes or 1 Kilobyte 1 Kilobyte

Which of the following is the largest? Storage Units: Quiz Which of the following is the largest? 3/5 2500 Gigabytes or 250 Terabytes 250 Terabytes

Which of the following is the largest? Storage Units: Quiz Which of the following is the largest? 4/5 10,000,000 Bytes or 8 Megabytes 10,000,000 Bytes

Which of the following is the largest? Storage Units: Quiz Which of the following is the largest? 5/5 1 Terabyte or 500 Gigabytes 1 Terabyte

Media Storage Music 3-4 min 128kbps MP3 40,000 3-4 min 320kbps MP3 16,000 3-4 min FLAC 6,500 3-4 min WAV 4000 Apple iPhone XR 128GB Please note these are approximate values

Media Storage Photos 8MP JPEG 45,000 12MP JPEG 30,000 12MP RAW 3,000 1,500 Apple iPhone XR 128GB Please note these are approximate values

Media Storage Video 480p Low Definition > 20 hours 720p Standard Definition (SD) > 10 hours 1080p High Definition (HD) < 5 hours 4k Ultra High Definition (UHD) < 30 mins Apple iPhone XR 128GB Please note these are approximate values

Apps (Mobile Applications) Media Storage Apps (Mobile Applications) Standard Apps 3000-5000 Games 200 Apple iPhone XR 128GB Please note these are approximate values

Media Storage Documents Presentations 10,000 Word Processor 700,000 Spreadsheets 200,000 Novels 400,000 Apple iPhone XR 128GB Please note these are approximate values