Question

Discovering Computers

510/2017 Take Test HW Input and Output (Fall 2017 ) Comp- Answer the following questions on this document. You can Google the answers and copy and paste. 1. In terms of storage devices, what is reading and writing? 2. Is a screen display volatile or nonvolatile? 3. What does access time measure? 4. How does the access 5. What does Creative Commons provide? 6. What are some disadvantages of SSDs? time of storage compare with the access time of memory? 7. Why might you opt for a hard disk rather than an SSD? 8. What does the term, geofence, mean? 9. Which is faster: sequential or direct access? Why? 10. Why would a developer include a backdoor in a program?

Answer 1

1. In terms of storage devices Reading is an action performed by computers, to acquire data from a source and then place them into the volatile memory for processing.

    Computers read information from sources such as magnetic storage, the internet, audio or video input ports.

While writing is an action performed if there is a need to write data to disk or any storage areas.

The I/O system is responsible for acknowledging that it has written the data to actual medium.

The I/O subsystem looks at the data to be written to disk, reorders the write operations to mke them serialised as possible.

2.   A volatile memory is computer memory that requires power to retain stored information. It retains its contents while powered, but when power is interrupted stored data is immediately lost. A best example is RAM.

While a non volatile memory is memory that does not lose its contents when the power is turned off. It is a permanent memory while volatile is temporary memory. EX:- ROM,flash memory etc.

A screen display is considered as volatile as its contents disappear when the power is turned OFF.

3. Access time is the time from the start of one storage device access to the time when the next access can be started. It is also called the delay or latency between request to a system and the access being completed.

Access time measures the time delay between the start of an access and a successful access.

4. The access time of a memory is 200,000 times faster than the access time of storage devices due to mechanical movements involved

Memory access time is the time required by a processor to access data or write data from and to memory chip.