Flashcards
C226 P04
Cards in this deck (14)
- 1What is a RAM?Random Access Memory (RAM)
- 2What are the difference a RAM and hard-disk- RAM holds the data in the circuitry that is directly connected to the system board.
- The hard-disk storage places the data on magnetic media.
- RAM is a temporary storage and permanent storage
RAM has lesser storage capacity than hard-disk storage. - 3What kind of memory is RAM classified as?- Volatile memory, once the power is off, the memory contained is lost.
- 4What are the characteristics that can be used to describe memory and storage devices?- Cost, Capacity, Volatile, Non-Volatile, Speed.
- 5Difference between Primary and Secondary storage.● Primary storage is faster and more expensive, directly accessed by the CPU E.g. are RAM, Cache with the exception of ROM (Read-Only-Memory)
● Secondary storages are Non-Volatile, Large capacity. E.g. are Hard disk, Tape Drives - 6What is DDR?Double Data Rate Synchronous Dynamic Random Access Memory.
- 7What are the differences between DDR2, DDR3, and DDR4?- Speed: DDR2 < DDR3 < DDR4
- Power consumption: DDR2 (1.8V) > DDR3 (1.5V) > DDR4 (1.2V)
- DDR4 is more expensive than DDR3. Not easy to find DDR2. - 8What is the purpose of processor cache?- One of the uses of the processor cache is to store data that future request of the data can be faster. E.G Locality of reference or Frequency of reference.
- 9What is the formula for Average Memory access time?Average memory access time = hit time + (miss rate x miss penalty)
- Access time = Overall time to get the data.
- Hit time = time took to retrieve data from the cache. - 10What is the formula of Average access time and Latency?- Average access time = latency + average seek time
- Latency = 30,000/Spindle Speed - 11How do we interpret the Average access time formula?- Latency: Disk latency is the time it takes for the selected sector to be positioned under the read/write head or is commonly known as the rotational delay.
- Seek time: Seek time is the time taken for a hard disk controller to locate a specific piece of stored data. - 12What is the difference between sequential access and direct(random) access?Random access - Hard disk
Sequential access - Tape drive
Sequential access mean that to access a group or an element, it is accessed in a predetermined sequence.
Random access means that it can access a group or an element of a data at any given condition or addressable location. - 13What are the factors affecting the transfer rate of the storage device?- Transfer Rate: Disk-to-buffer data transfer rate
- Access Time: Time to access the data on an HDD
- Besides access time, the access speed will also be affected by the latency delay and the connector to the device - 14What are the differences between HDD and SSD?● SSDs have no moving parts
● SSDs have faster access time (read/write)
● SSDS -have a higher cost per byte figure
● SSDs are more robust/ less fragile
● SSDs consume less power
● SSDs have a smaller physical size
● SSDs are unaffected by magnets and magnetic fields
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- - RAM (Random access memory) - Difference between RAM and hard-d¬isk. - What kind of memory is RAM classified as? - What are the characteristics that can be used to describe memory and storage devices? - Difference between Primary and Secondary storage. - What is DDR? - What are the differences between DDR2, DDR3 and DDR4? - What is the purpose of processor cache? - What is the formula for Average Memory access time? - What is Hit time and Access time? - What is the formula of Average
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- Syabil Hafizdini
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