Magnetic Storage - A magnetic hard disk drive is the most common form of secondary storage within desktop computers. They can also be external and connected through a USB port. A floppy disk is another example. Another example is a magnetic tape which has high storage capacity but has to be accessed in order so it is generally only used by companies to back up or archive large amounts of data. , Magnetic Storage Characteristics - Large capacity and cheaper than a solid state drive. Not durable and not ver portable as it can be damaged easily. Quick to access data but slower than an SSD., Optical Storage - Use a laser to project beams of light onto a spinning disc, allowing it to read data. Examples are CD, DVD and Blu Ray- They are the slowest of the four types of secondary storage., Optical Storage Characteristics - Low capacity. Not durable - break and scratch easily. Thin. Portable. Slow access speed., Solid State Storage - No moving parts. Replacing hard drives. Quieter and faster and use less power. They can also be external. A USB is an example that is used to transport files easily. Memory cards an SD cards that are used in digital cameras or Micro SD cards for a mobile phone are also examples., Solid State Storage Characteristics - High capacity. Expensive compared to magnetic storage. Durable. Cheap USBS can break/snap. Small size so very portable., Paper Storage - Printed or handwritted documents. Inexpensive in small quanitities. Can take up lots of space. Environmentally damaging. Requires physical security methods. , Paper Storage Characteristics - Low capacity. Takes up physical space. Poor durability and can tear or get damaged easily. Portable in small quantities. Access speed can be slow., Primary Storage - (also known as main memory ) is the component of the computer that holds data , programs and instructions that are currently in use. Primary storage is located on the motherboard . As a result, data can be read from and written to primary storage extremely quickly., Secondary Storage - Secondary storage is non-volatile , long-term storage. It is used to keep programs and data indefinitely. Without secondary storage, all programs and data would be lost the moment the computer is switched off., Volatile - memory that loses its contents when the computer has no power. Memory is limited in size, Non-volatile - memory that keeps its contents even when the computer is switched off., RAM - Volatile, ROM - Non-volatile,

1.2 Storage Media

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