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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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| Question | Answer |
| What is a Storage Device? | > Any device used for either temporary or permanent storage of data - internal or external |
| What are the 3 (Main) Storage Types? | > Optical > Magnetic > Solid State (sorry vinyl records, you don't get a category) |
| Define the Following Storage-Related Terms: > Capacity > Speed > Durability > Reliability > Portability > Cost | > Capacity - how much data can be stored on the medium (i.e., how many bytes) > Speed - data transfer speed (e.g., MB/s) > Durability - how easily damaged the medium is > Reliability - how good is the medium's longevity (i.e., does it last a long time) > Portability - how easy it is to move and share the medium > Cost - how expensive it is to produce the medium (e.g., £/MB) |
| What is Optical Storage? | > Data is stored on a disc > Laser creates marks in a pattern across the disc (burning) > Laser detects these marks from the inside out and translates them to a readable format (reading) > Marks are pits and lands which represent 1s and 0s / binary data > Write once, read only - surface of the disc is literally burnt - Re-usable discs use a reversible reaction |
| What are the Advantages and Disadvantages of Optical Storage? | > Cheap > Portable > Lightweight > Durable (i.e., if dropped) > Slow > Not durable (i.e., scratched easily) > Not reliable |
| What is Magnetic Storage? | > Arm or head reads / writes across the medium by modifying the polarity of magnetic discs or tape > Polarity represents binary data, thus can be re-written > Disc based magnetic storage (e.g., HDDs) - Data is stored in sectors within circular tracks - Data becomes fragmented > Tape based magnetic storage (e.g., reel to reel tapes) - Data is stored across a tape, which may have multiple tracks for simultaneous reading |
| What are the Advantages and Disadvantages of Magnetic Storage? | > Large capacity (massive in case of tapes) > Reliable, fairly durable (HDDs) > Moderately priced (HDDs) > Fairly fast transfer speed (HDDs) > Dead cheap y'know (tapes) > Not durable (i.e., if comes in contact with a magnet, data is removed) > Slow (tapes - although is not a huge concern for the use case) |
| What is Solid State Storage? | > Made of transistors (essentially tiny electronic switches... electronic as in with electrons, although they are also electronic as in electricity. so all type of electronics) > Transistors' value represents binary data > Transistors use an oxide layer to trap electrons when electricity is present (or in some cases electricity is only needed to change the transistor's value) > No moving parts at all (solid state) |
| What are the Advantages and Disadvantages of Solid State Storage? | > Extremely fast transfer speed > Very durable > Extremely reliable > Very portable > Extremely expensive compared to other types |
| What is Virtual Storage? | > Cloud storage > Storing and retrieving data over the internet > Presents an abstraction - data seen as one, unfragmented file may be split over multiple drives and media |
| What are the Advantages and Disadvantages of Virtual Storage? | > Data can be access at any time, any where an Internet connection is present > Easy to collaborate and share files > Can become very expensive to buy > Requires the Internet > Data access speed is dependent on Internet speed |
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