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Specify currency unit in the "Price" row of the storage compar… (#1755)

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* Specify currency unit as CNY in the "Price" row of the storage comparison table

* Revert changes to the English version

* Change currency unit to USD

* fix

* fix space

* Update ram_and_cache.md

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Co-authored-by: Yudong Jin <krahets@163.com>
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Dr.XYZ
2025-06-12 20:57:47 +08:00
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en/docs/chapter_array_and_linkedlist/ram_and_cache.md
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@@ -10,13 +10,13 @@ There are three types of storage devices in computers: <u>hard disk</u>, <u>rand
<p align="center"> Table <id> &nbsp; Computer storage devices </p>
| | Hard Disk | Memory | Cache |
| ---------- | -------------------------------------------------------------- | ------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------- |
| Usage | Long-term storage of data, including OS, programs, files, etc. | Temporary storage of currently running programs and data being processed | Stores frequently accessed data and instructions, reducing the number of CPU accesses to memory |
| Volatility | Data is not lost after power off | Data is lost after power off | Data is lost after power off |
| Capacity | Larger, TB level | Smaller, GB level | Very small, MB level |
| Speed | Slower, several hundred to thousands MB/s | Faster, several tens of GB/s | Very fast, several tens to hundreds of GB/s |
| Price | Cheaper, a few cents to a few dollars / GB | More expensive, tens to hundreds of dollars / GB | Very expensive, priced with CPU |
| | Hard Disk | Memory | Cache |
| ----------- | -------------------------------------------------------------- | ------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------- |
| Usage | Long-term storage of data, including OS, programs, files, etc. | Temporary storage of currently running programs and data being processed | Stores frequently accessed data and instructions, reducing the number of CPU accesses to memory |
| Volatility | Data is not lost after power off | Data is lost after power off | Data is lost after power off |
| Capacity | Larger, TB level | Smaller, GB level | Very small, MB level |
| Speed | Slower, several hundred to thousands MB/s | Faster, several tens of GB/s | Very fast, several tens to hundreds of GB/s |
| Price (USD) | Cheaper, a few cents / GB | More expensive, a few dollars / GB | Very expensive, priced with CPU |
The computer storage system can be visualized as a pyramid, as shown in the figure below. The storage devices at the top of the pyramid are faster, have smaller capacities, and are more expensive. This multi-level design is not accidental, but a deliberate outcome of careful consideration by computer scientists and engineers.