📚 3 Data storage | 数据存储
In modern science, the ability to record, store and retrieve information is just as important as conducting experiments. Whether you are saving temperature readings from a digital thermometer, storing microscope images or backing up your laboratory report, data storage plays a central role. Scientists rely on a variety of storage media and units to keep their measurements safe and accessible. This article explains the key concepts of data storage that every IGCSE science student should understand, from binary digits to cloud servers.
在现代科学中，记录、存储和检索信息的能力与进行实验同样重要。无论你是在保存数字温度计的读数、存储显微镜图像，还是备份实验报告，数据存储都起着核心作用。科学家们依赖各种存储介质和单位来确保测量数据的安全和可访问。本文解释了每一位IGCSE科学学生都应该掌握的数据存储关键概念，从二进制数字到云服务器。
1. What is Data Storage? | 什么是数据存储？
Data storage refers to the process of saving information in a form that can be retrieved and used later. In science, data can be numbers, text, images, audio or video captured during investigations. Storage can be temporary, like the memory in a data logger, or permanent, like a file saved on a hard disk. The choice of storage medium depends on how quickly we need to access the data and how long we need to keep it.
数据存储是指将信息以可以稍后检索和使用的形式保存下来的过程。在科学中，数据可以是数字、文本、图像、音频或调查期间捕获的视频。存储可以是临时的，比如数据记录器中的内存；也可以是永久的，比如保存在硬盘上的文件。存储介质的选择取决于我们需要多快访问数据以及需要保存多长时间。
2. Analogue and Digital Data | 模拟数据与数字数据
Data can be analogue or digital. Analogue data changes continuously, such as the voltage from a temperature sensor or the grooves on a vinyl record. Digital data is made up of discrete values, usually represented as binary numbers (0s and 1s). Most modern scientific instruments convert analogue signals into digital data using an analogue-to-digital converter (ADC), because digital data is less affected by noise and easier to store and process.
数据可以是模拟的或数字的。模拟数据连续变化，例如温度传感器的电压或黑胶唱片上的沟槽。数字数据由离散的值组成，通常表示为二进制数字（0 和 1）。大多数现代科学仪器使用模数转换器（ADC）将模拟信号转换为数字数据，因为数字数据受噪声影响较小，且更易于存储和处理。
3. Bits, Bytes, and Binary | 位、字节与二进制
present 256 different values (2⁸ = 256), which is enough to encode a single character like 'A' magnetised or not magnetised, high voltage or low voltage, pit or land on an optical disc.
数字数据的最小单位是位（二进制数字），它可以是 0 或 1。8 个位组成一个字节。一个字节可以表示 256 个不同的值（2⁸ = 256），这足以编码一个字符（如“A”）或一个小数字。计算机和数据记录器使用二进制，因为它可以通过两种状态物理表示，例如磁化或未磁化、高电压或低电压、光盘上的凹坑或平面。
4. Data Storage Units | 数据存储单位
en 2¹⁰ (1024) bytes. IGCSE science often uses these approximate conversions: 1 kB ≈ 1000 bytes, 1 MB ≈ 1,000,000 bytes, and so on. A typical photograph takes up a few MB, while a high-definition video can be several GB.
由于现代数据文件可能非常大，我们使用更大的单位来衡量存储容量。基本单位是字节（B）。常见的倍数包括千字节（kB）、兆字节（MB）、吉字节（GB）和太字节（TB）。在国际单位制（SI）中，1 kB = 10³ 字节，但在计算中往往是 2¹⁰（1024）字节。IGCSE 科学通常使用这些近似换算：1 kB ≈ 1000 字节，1 MB ≈ 1,000,000 字节，以此类推。一张典型的照片占几 MB，而一段高清视频可能占几 GB。
5. Magnetic Storage Devices | 磁性存储设备
Magnetic storage uses magnetisable material to record data. A hard disk drive (HDD) contains spinning platters coated with a magnetic layer. A read/write head changes the direction of tiny magnetic regions to represent 0s and 1s. Magnetic tape is another form, often used for long-term backup of scientific data because it is inexpensive and can store huge amounts of data. However, magnetic storage can be damaged by strong magnets or physical shock.
磁性存储使用可磁化材料来记录数据。硬盘驱动器（HDD）包含涂有磁性层的旋转盘片。读/写磁头改变微小磁性区域的方向来表示 0 和 1。磁带是另一种形式，通常用于科学数据的长期备份，因为它价格低廉且可以存储大量数据。然而，磁性存储可能会被强磁铁或物理冲击损坏。
6. Optical Storage Devices | 光学存储设备
Optical storage uses laser light to read and write data. Compact discs (CDs), digital versatile discs (DVDs) and Blu-ray discs have reflective surfaces with tiny pits and lands. A laser beam detects the difference in reflection between a pit and a land, interpreting them as binary values. Optical media are portable and reasonably durable, but they have limited capacity compared with modern hard drives and flash drives. In school laboratories, optical discs may be used to store microscope images or recorded experimental videos.
光学存储使用激光来读写数据。光盘（CD）、数字多功能光盘（DVD）和蓝光光盘具有微小的凹坑和平面组成的反射表面。激光束检测凹坑和平面之间的反射差异，将其解释为二进制值。光学介质便于携带且相当耐用，但与现代硬盘和闪存驱动器相比，容量有限。在学校实验室中，光盘可能用于存储显微镜图像或录制的实验视频。
7. Solid-State Drives and Flash Memory | 固态硬盘和闪存
Solid-state storage has no moving parts. It stores data using electrically floating gates in memory cells made of semiconductors. USB flash drives, SD cards and solid-state drives (SSDs) are common examples. They are faster, lighter and more resistant to physical shock than magnetic drives. Many data loggers and digital sensors in science lessons rely on flash memory to record measurements even when the device is turned off. The main disadvantage is that flash memory cells can wear out after many write cycles.
固态存储没有移动部件。它利用半导体存储单元中的电浮置栅极来存储数据。USB 闪存驱动器、SD 卡和固态硬盘（SSD）是常见的例子。它们比磁驱动器更快、更轻，且更抗物理冲击。许多科学课上的数据记录器和数字传感器都依赖闪存，即使在设备关闭时也能记录测量数据。主要缺点是闪存单元在多次写入周期后会磨损。
8. Cloud Storage and Data Centres | 云存储与数据中心
Cloud storage means storing data on remote servers accessed via the internet. Large data centres house thousands of hard drives and SSDs, providing vast capacity and redundancy. For IGCSE science projects, cloud platforms allow students to collaborate on data analysis and ensure their work is not lost if a personal device fails. However, cloud storage depends on internet connection speed and raises questions about data security and privacy.
云存储是指将数据存储在通过互联网访问的远程服务器上。大型数据中心容纳了成千上万的硬盘和固态硬盘，提供了巨大的容量和冗余。对于 IGCSE 科学项目，云平台使学生能够协作分析数据，并确保在个人设备故障时工作不会丢失。然而，云存储依赖于互联网连接速度，并引发了数据安全和隐私方面的问题。
9. Storing Scientific Data | 科学数据的存储
In practical science, students often use data loggers with temperature, light, pH or motion sensors. These devices capture readings at set intervals and store them digitally. The stored data can then be transferred to a computer for plotting graphs and performing calculations. When storing scientific data, it is essential to label files clearly, use appropriate units, and keep original raw data unchanged. Many investigations also require you to state how data was stored and backed up to ensure reproducibility.
在实践科学中，学生经常使用带温度、光照、pH 或运动传感器的数据记录器。这些设备按设定的时间间隔捕获读数并将其数字化存储。存储的数据随后可以传输到计算机以绘制图表和进行计算。在存储科学数据时，清楚地标记文件、使用适当的单位以及保持原始数据不变至关重要。许多探究还要求你说明数据是如何存储和备份的，以确保可重复性。
10. Data Reliability and Backup | 数据可靠性与备份
Data loss can ruin weeks of experimental work. For this reason, scientists always make backups—copies of data kept in a different location or on a different medium. Common backup strategies include the 3-2-1 rule: keep three copies of your data, on two different storage types, with one copy stored off-site. Verifying data integrity using checksums or simply re-opening files helps detect corruption early. Reliable storage practices are part of good scientific methodology.
数据丢失可能毁掉数周的实验工作。因此，科学家们总是进行备份——将数据副本保存在不同的位置或不同的介质上。常见的备份策略包括 3-2-1 规则：保留三份数据副本，使用两种不同的存储类型，其中一份存储在异地。使用校验和或简单地重新打开文件来验证数据完整性，有助于及早发现损坏。可靠的存储实践是良好科学方法的一部分。
Published by TutorHao | Science Revision Series | aleveler.com
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