Karteikarten
Topic C
Karten in diesem Stapel (18)
- 1what is an input devicean external device that allows external data to be entered into a computer system
e.g: keyboard, mouse, microphone, scanner, joystick - 2what is an output devicethese are devices that take data stored on in a digital form on the computer and convert it into a format that humans can process, via different mediums, E.G, projector, speakers, monitor
- 3what is storage device?any device used for either temporary or permanent storage of data
3 types of storage are: Magnetic flash and optical - 4what is primary and secondary storage?primary storage is computer memory directly accessible by the cpu. it contains RAM which hold data of current running programs. It is volatile so when the system shuts down the memory is wiped
secondary storage is non volatile storage external to the cpu - 5what is optical drive?includes, cd, dvd
storage that works using lasers to create and interpret data on disc media.
to enter data a laser is shone at media in order to create small areas of unreflective disc called pits and leave other sections unburned called lands which reflect
when reading, a small laser shines onto the disc and measures amount of light reflected back. reflective and non reflective areas are interpreted as 1s and 0s - 6what is CD ROM and CD R and CD RWCD ROM is read only which is pre written and cant be overwritten
CDR media are blank. An optical device writes data to them by shining a laser onto the disc. can only be written to once
cd rw is a disc that can be rewritten to more than once - 7benefits and cons of optical drive?+cheap to produce
+ lightweight due to nature of disc
+small in physical size and mass so highly portable
- prone to scratches and physical damage which makes it difficult to read data and make it corrupted
-lower data store capacity
- slow to access data as data is read from inside disc to outside disk. - 8what is magnetic storage?this is storage that uses varying states of magnetisation to represent 0s and 1s.
particles on the disk are polarised to become either north or south state. these states represent 0s and 1s
it has a drive head that moves across the disk to read and write data - 9pros and cons of magnetic drive?large capacity
cheap
-data has to be read and written sequentially and so access times may be slow
- moving parts could cause damage or eventually fail
fragile - 10what is solid state drive?it is storage the processes data based on electrical charge.
the disk has millions of NAND flash memory cells. these cells are either charged or uncharged which represents a 0 or 1 respectively. - 11pros and cons of SSD?external disks are extremely light and portable
have no moving parts making them less susceptible to damage.
-expensive
-increased voltage requirement every time data is written. eventually voltage will be too high to write into page - 12what is ROMROM is a small piece of memory located on the motherboard which holds information that needs to be permanent in memory.
it is non volatile meaning when system switches off the contents of memory are retained.
The initial startup instructions (bootstrap) are stored in ROM - 13what is RAMRam is temporary storage of instructions and data currently being executed by processor.
Much faster access speeds than secondary storage.
volatile as data withheld disappears when system powers off - 14what does a computer need to do to get instructions in the cpu?the computer needs to load the operating system so that is can start using the cpu.
the operating system is stored on the hard drive and is inactive until loaded.
the solution is the ROM, which contains which contains the bios and the bootstrap which is a set of instruction which carry out the startup of all the systems - 15what is the POST?Power on Self test sends signals to all the computer components to ensure functionality and alerts CPU of their existence. it then uses the bootstrap to load the OS into main memory
- 16what is virtual storage (cloud storage)virtual storage is the idea of storing and retrieve over the internet in the cloud as oppose to using local storage device
- 17advantages of cloud storage?data can be accessed at any time for any device given there is internet connection
Flexibility to scale storage requirements up and down based on your needs
reduced costs of hardware - 18disadvantages of cloud storage?can become expensive and a lot of providers will charge increasing fees for additional storage space
access to files is dependent on internet connectivity and if there is no connection, there is no access
using cloud storage, depending on provider may result in loss of functionality and compromise level of control u have
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- Beschreibung
- Highers computing (semester 1) Karteikarten am Topic C, erstellt von Daniel Nnajiuba am 20/08/2022.
- Erstellt von
- Daniel Nnajiuba
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