Module 3 - Unit 4 - Using Computer Hardware Flashcards
What is System Memory?
System memory is the main storage area for programs and data when the computer is running.
Why do we need system memory as opposed to using mass storage?
It is much faster accessing data in system memory than in a mass storage system.
What memory is system memory and how it differs from mass storage?
System memory is volatile, which means it needs a constant supply of power source in order for it to retain memory, where as mass storage system will retain data even when the power source is turned off.
What is DRAM and how it functions?
DRAM stands for Dynamic Random Access Memory and is utilized as System RAM. It stores each data bit as an electrical charge within a single bit cell. Dynamic memory has to be refreshed periodically by accessing each cell at regular intervals via electrical source.
What is SDRAM and how it functions?
SDRAM stands for Synchronous Dynamic Random Access Memory. It is synchronized to the system bus whereby a set limit of memory can be transmitted each clock cycle. It is package in DIMMs (Dual Inline Memory Module).
How does a Double Data Rate SDRAM differs from jus SDRAM?
The data transfer is “doubled pumped” which means the set limit of bits is transferred at the start of a clock cycle and the same amount is then transferred at the end.
What varies from the different versions of DDR?
DDR has increased bandwidth over the course of its change. The increased bandwidth is due to the increase in bus speed rather than the speed of each memory chip. In turn, it won’t make the chips run too hot although it would take longer to access each chip.
True or False. Putting a DDR3 module into a DDR4 motherboard would work because it is backward compatible.
False. A newer version of DDR modules will not match with older versions since the connectors are different.
What is mass storage?
Mass storage is when data is stored and preserved on a medium even when the power is turned off.
How are data stored on Hard Disk Drives (HDD)?
Data on an HDD is encoded magnetically on specially coated glass or plastic platters accessed by drive heads.
List and describe the performance measures of HDD
i) Revolutions per minute (RPM) - the speed at which disk can spin, directly proportionate to read/write speeds
ii) Access time - the delay that occurs as the read/write head locates a particular position on the drive, depended on RPM.
How are data stored on Solid State Drives (SSD)?
SSD uses a type of non-volatile memory technology called flash memory. Flash memory is a transistor based technology where data is stored by the presence of electrons in the transistors.
How does a hybrid drive of both SSD and HDD works?
SSD portion functions as a large cache, containing data that is accessed frequently. The magnetic disc is only spun up when non-cached data is accessed.
Name 3 types of optical discs
a) Compact Disc (CD)
b) Digital Video Disc (DVD)
c) Blu-ray Disc (BD)
How are data stored on optical discs?
There is layer(s) of pits and lands where data is stored in it.
