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A teacher uses tablet computers with students to teach programming online - Edexcel - GCSE Computer Science - Question 3 - 2019 - Paper 1
Question 3
A teacher uses tablet computers with students to teach programming online. (a) Describe how data is stored on solid state devices. (b) State two functions of utili... show full transcript
Worked Solution & Example Answer:A teacher uses tablet computers with students to teach programming online - Edexcel - GCSE Computer Science - Question 3 - 2019 - Paper 1
Step 1
Describe how data is stored on solid state devices.
Answer
Data on solid state devices (SSDs) is stored using flash memory, which is a type of non-volatile storage. This means that the data is retained even when the device is powered off.
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Memory Cells: SSDs utilize NAND flash memory, consisting of numerous memory cells made from floating-gate transistors. These cells can hold bits of data (0s and 1s) based on the electrical charge stored in them.
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Data Block Organization: Data is organized in blocks. When data is written, it is written in pages within these blocks. However, when data is updated, the old data cannot be directly overwritten; instead, it must be rewritten to a new block, and the old block is marked as invalid.
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Wear Leveling: To ensure that all cells wear out evenly, SSDs implement wear leveling algorithms, which help spread out write and erase cycles across the memory cells, prolonging the lifespan of the device.
Step 2
State two functions of utility software.
Answer
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Disk Management: Utility software aids in managing the disk by providing functions such as formatting, partitioning, and optimizing the storage space on a hard drive.
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Data Backup: Another critical function is to create backups of data to prevent loss due to hardware failures, accidents, or malware.
Step 3
Draw a circle around the protocol and a rectangle around the domain name.
Answer
The protocol "https://" can be circled, and the domain name "www.pearson.co.uk" can be enclosed in a rectangle. However, since drawing cannot be performed here, it is essential to visualize that the protocol should have a circle drawn around it and the domain name enclosed within a rectangle.