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35 Cards in this Set
- Front
- Back
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What does WIMP stand for |
Windows, icons, menus, pointers |
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What are the features of a UI? |
Separate from the os. Has a desktop environment. Has a window manager.
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What can a GUI do? |
Execute programs File management Has tools to configure and interact with the os |
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What does a window manager do? |
Controls where the windows are placed, which are active,ect |
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What does the display server do?t |
Passes communication between the OS and GUI. Decides what is displayed and how. |
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What are the 4 packet types of a X Window System |
Request Reply Event Error |
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What might a display server be connected to? |
Remote client terminals |
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What is polling? |
A periodical check for input |
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What is an interrupt |
A part of a system that stops and checks a process |
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What is an interrupt |
A part of a system that stops a process when it’s finished. |
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What does a Boom on a disk do |
Has a Actuator arm which moves the heads between the inner and outer tracks on the platter. |
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What does a head on a disk do? |
Moves close to the surface of the platter. Read and writes the magnetic data. |
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What does the spindle do on a disk? |
Holds the platters in place. The platters spin around it. |
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What does a Plater on a disk do? |
Magnetic data storage medium; an individual disk. |
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What does a track do on a disk? |
It’s a full circular area on the platter which holds data. |
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What is a sector on a disk? |
It’s a particular part of the track. |
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What does a cylinder do on a disk. |
It’s the volume combining matching tracks on different platters. |
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Reading left to right what are parts of the sector labelled. |
Header, gap, data, ECC, Gap |
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On a sector what does a header do? |
Contains the address and error checking information. |
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On a sector what does a gap do? |
It gives the head time to change operation. |
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On a sector what does EEC stand for? |
Contains the Error Correcting code |
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What happens to a disk during a write operation? |
The disk controller: 1) Moves the head to the correct cylinder. 2) Selects the read head. 3) Waits for the correct sector to be under the head. 4) Reads the sector and compares it to the CRC. 5) Selects the write head. 6) Writes the data. 7) Calculates and writes ECC for the data. |
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What happens during a read operation? |
The disk controller: 1) Moves head to the correct cylinder. 2) Selects it’s read head. 3) Waits for the correct sector to be under the head 4) Reads the sector header and compares it to the CRC. 5) Reads the data. 6) Reads the ECC and corrects any data that it needs to. |
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What does the CRC do? |
Checks the header information is correct. |
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What are the different types of file allocation? |
Contiguous vs non contiguous. Indexed allocation Linked allocation Clustering |
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What do file’s data blocks do at the end? |
Point to the next data block. |
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What does ROM stand for? |
Read only memory. It contains the start up memory and doesn’t need power to keep its memory. |
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What does RAM stand for? |
Random access memory. Only keeps its memory whilst it has power. |
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What types of memory are involved with ROM? |
PROM EPROM EEPROM |
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What does PROM stand for and how does it work. |
Programmable read only memory. It is made up of fuses which have a value of 1 when the fuse is burnt it now equals 0. |
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What EPROM stand for and what is its main feature |
Erasable programmable read only memory. Works like PROM except its data can be erased using uv light. |
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What EEPROM stand for and what is its main feature |
Electrically erasable programmable read only memory. Like a PROM. Except is data can be erased using electrical charges. |
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What is RAM made up of? |
SRAM DRAM |
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What is SRAM and what’s it’s main feature |
Static RAM. It’s fast and expensive. It doesn’t need to be refreshed. Its memory is stored in caches and is the storage for frequently used instructions. |
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What is DRAM and what is it’s main feature. |
Dynamic RAM. Needs to be refreshed. It’s slower than SRAM but also cheaper. |
