1.2.2 - Secondary storage
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Why do computers need secondary storage?
It provides, non-volatile, long term storage for programs, applications and operating systems, etc. mark scheme bit: to store data/files long-term/permanently // without secondary the user’s files will not be stored when the power is turned off // store data not currently being used
What are the three main types of secondary storage?
Optical, Magnetic, Solid-State.
What is an example of optical storage?
CDs, DVDs, and Blu-ray discs.
What is an example of magnetic storage?
Hard Disk Drives (HDDs) and Magnetic Tape.
What is an example of solid-state storage?
Solid-State Drives (SSDs), USB Flash Drives, and Memory Cards.
What factors should you consider when choosing storage?
Capacity, speed, portability, durability, reliability, cost.
What are the advantages of optical storage?
Discs are very thin, Portable, Also cheap/inexpensive, Good for media storage.
What are the disadvantages of optical storage?
Low data capacity, NOT durable because discs are very fragile and easily scratched, Slowest data access speed.
What are the advantages of magnetic storage?
High capacity, Cheap per GB, Quick data access speed, Reliable for long term storage. mark scheme bits: * (Usually) cheaper cost to purchase per unit of data * Sufficient/good durability for what is needed * … computer unlikely to move (regularly) // by example * Sufficient/fast speed of access * …no significant delays in storing/reading data * (Long-term) reliable // longevity * …unlikely to need to purchase another //unlikely to break from over-use * High capacity * … e.g. file size of sound files can be large // allows the musician to store files with higher bit depth
What are the disadvantages of magnetic storage?
Slower than SSDs, Moving parts can are susceptible to damage.
What are the advantages of solid-state storage?
High capacity, Fastest data access speed, Durable, Portable because of small size. mark scheme bits: * Cost often equates to magnetic per quantity // not expensive per unit of data * Durable // robust // no moving parts * …so computer can be moved without risk of losing data * Fast speed of access of data * … no significant delays in storing/reading data // musician does not have to wait for files to load/store * High capacity // (nearly the) same/higher capacity than magnetic * …file size of sound can be large * Small in physical size * … device is portable // can fit in a smaller type of computer * Produces less sound when running * … so the musician distracted * Requires little/less power (compared to others) * … so running costs are reduced * Drives do not get fragmented files * … drives do not need to be defragged // constant access time
What are the disadvantages of solid-state storage?
More expensive per GB, Limited read/write cycles.
Which type of storage has the highest capacity?
Magnetic storage (HDDs and Magnetic Tape).
Which type of storage is the fastest?
Solid-state storage (SSDs and Flash Drives).
Which type of storage is the most portable?
Solid-state storage (USB Flash Drives and Memory Cards).
Which type of storage is the most durable?
Solid-state storage (SSDs and Flash Drives).
Which type of storage is the most reliable?
Solid-state storage (SSDs and Flash Drives).
Which type of storage is the cheapest per GB?
Magnetic storage (HDDs and Magnetic Tape).