Computer Fundamentals 简明教程

Computer - CompactFlash Card

What is a CompactFlash Card?

CompactFlash 卡是一种用于存储数据的存储卡。它也被称为 CF 卡，由 SanDisk 于 1994 年开发。CompactFlash 卡是一种闪存，将数据存储在微小芯片上。此卡没有移动机械部件；因此，无需电池来保留数据。

A CompactFlash card is a memory card used to store data. It is also known as CF card which was developed by SanDisk in the year 1994. A CompactFlash card is a type of flash memory that stores the data on a tiny chip. This card does not have moving mechanical parts; so, it does not require a battery to retain data.

compactflash card

CompactFlash 卡是最广泛使用的便携式存储设备之一，它尺寸较小且更可靠。它最广泛用于计算设备，以提供更快且可靠的数据存储。它是一种闪存，用作数码图像和摄像机的可移动存储器，但也可以在 PDA 和便携式音乐播放器等个人设备上找到它。

A CompactFlash card is one of the most widely used portable storage devices which is smaller in size and a more reliable storage device. It is most widely used in computing devices to provide faster and reliable data storage. It is a type of flash memory used as a removable storage for digital images and video cameras, but it can also be found on personal devices such as PDAs and portable music players.

CompactFlash 卡最初的存储容量从兆字节到千兆字节不等。现代 CF 卡可提供高达 512GB 或更高的存储容量。最早的 CompactFlash 卡使用 NOR 闪存设计，可以随机读取和写入数据。这一特性使其成为存储图像或文本类型数据的理想且流行的选择。

A CompactFlash card was initially offered with storage capacities ranging from megabytes to several gigabytes. Modern CF cards can offer storage capacities of up to 512GB or more. The earliest CompactFlash cards were designed using NOR flash memory that can read and write data in random order. This feature made it ideal and popular to store images or text-type data.

NOR 闪存较慢且更昂贵；后来，闪存使用了 NAND 闪存，并变得更流行且更便宜。NAND 闪存速度更快，可以按串行顺序写入，非常适合存储大型文件，例如视频或音乐。

NOR flash memory was slower and more expensive; later on, flash memory used NAND flash memory and became more popular and less expensive. NAND flash memory is speedier and can be written in serial order, making it ideal for storing large files like video or music.

Significances of CompactFlash Card

提供不同存储容量的 CompactFlash 卡，可大量存储高分辨率照片、影片和其他大文件。这对于需要保存大量数据的摄影师和摄像师而言尤其有用。这些卡提供不同的存储容量，范围从 8GB 到 512 GB。CompactFlash 卡的容量由用于数据存储的 NAND 闪存芯片数量决定。CompactFlash 卡在恶劣的环境中更可靠。如今，CompactFlash 卡用于工业应用和现场专业用途。

CompactFlash cards are available with different storage capacities which enable it for substantial storing of high-resolution photos, films, and other significant files. This is especially useful for photographers and videographers who need to save a lot of data. These cards are available with different storage capacities ranging from 8GB to 512 GB. A CompactFlash card’s capacity is defined by the number of NAND flash chips used for data storage. CompactFlash cards are more reliable in harsh environments. Nowadays, CompactFlash cards are used in industrial applications and professional use in the field.

CompactFlash 卡被广泛使用，并且仍然与许多高端相机、摄像机和其他专业设备兼容。它们在行业中的悠久历史提供了持续的维护和与传统设备的兼容性。CompactFlash 卡提供一致且稳定的性能，这对于需要不间断数据存储和检索的应用程序至关重要。CompactFlash 卡旨在保护数据完整性，降低丢失或损坏的可能性。这对需要保护其工作的专业人士以及需要数据完整性的工业应用至关重要。

CompactFlash cards are widely used and still compatible with many high-end cameras, camcorders, and other professional equipment. Their extensive history in the industry provides continuing maintenance and compatibility with legacy equipment. CompactFlash cards offer consistent and stable performance, which is crucial for applications requiring uninterrupted data storage and retrieval. CompactFlash cards are intended to protect data integrity, lowering the chance of loss or corruption. This is vital for professionals who need to protect their work, as well as for industrial applications that require data integrity.

尽管有 SD 卡和 microSD 卡等较新的存储卡开发，但 CompactFlash 卡仍然在需要其耐用性、高容量和一致性能的情况下有用。

Despite the development of newer memory cards like SD cards and microSD cards, CompactFlash cards remain useful in situations where their longevity, high capacity, and consistent performance, are necessary.

How does CompactFlash Card work?

CompactFlash 卡的工作原理是将其插入针孔，以便卡正常工作。CF 卡易于使用。它们使用 FAT32 或 exFAT 格式并兼容。

CompactFlash cards work by plugging them into pinholes for the card to function correctly. CF cards are easy to use. They use FAT32 or exFAT formatting and are compatible.

CompactFlash 卡采用 NAND 闪存。数据存储在分组到块中的存储单元中。每个单元包含一定数量的位，通常是单级单元 (SLC) 的一位，而多级单元 (MLC) 的更多。传统的 CF 卡使用并行 ATA (PATA) 接口在卡和主机设备之间传输数据，而高级 CompactFlash 卡可以使用 CFexpress 标准，该标准使用 PCIe 接口来实现更高的数据传输速率。

CompactFlash cards employ NAND flash memory. Data is stored in memory cells that are grouped into blocks. Each cell contains a set number of bits, usually one bit for single-level cells (SLC) and more for multi-level cells (MLC). Traditional CF cards use the Parallel ATA (PATA) interface for transferring data between the card and the host device while advanced CompactFlash cards may employ the CFexpress standard, which uses the PCIe interface for higher data transfer rates.

每张 CF 卡都包括一个用于数据存储和检索的控制器。控制器负责磨损均衡和错误校正等功能。当数据被写入卡时，控制器将其分配到适当的存储单元。在读取操作期间，控制器从单元接收数据并将其传输到主机设备。CF 卡需要电源才能工作。插入设备时，设备将为卡工作提供所需的电能。

Each CF card comprises a controller for data storage and retrieval. The controller is in charge of functions such as wear levelling and error correction. When data is written to the card, the controller assigns it to the proper memory cells. During a read operation, the controller receives data from the cells and transfers it to the host device. CF cards require a power supply to function. When plugged into a device, the device supplies the electricity required for the card to work.

Types of CompactFlash Cards

CompactFlash (CF) 卡有不同类型；如下所示：

CompactFlash (CF) cards are come in different types; these are as follows −

CompactFlash (CF) cards Type

Description

CF Type I

It’s a standard CompactFlash card measuring 3.3mm in thickness. It is most widely used in digital cameras, camcorders, and other related devices.

CF Type II

These are thicker at 5mm; their storage capacity is comparatively more.

Cfast

These cards use a Serial ATA (SATA) interface to work on faster data transfer principles. It has a 3.3mm thickness. It is used in cameras, camcorders, and other professional equipment.

Cfexpress

These cards use the PCIe and NVMe interfaces which have higher data transfer rates. Its thickness may vary in size. These cards are more likely used in video recording and burst photography.

UDMA (Ultra Direct Memory Access) CF Cards

These CompactFlash cards use UDMA protocol and have higher data transfer rates. It has a 3.3mm thickness. These are most widely used in professional photography and video applications.

Industrial CF Cards

These CF cards are designed to survive high temperatures, vibrations, and shocks. Its thickness may vary in size. These are most widely used in industrial PCs and automation systems.

Features of CompactFlash Card

CompactFlash 卡的一些主要特点如下：

Some of the key characteristics of CompactFlash Card are as follows −

  1. Higher Performance − CompactFlash cards are much faster than other memory cards, such as SD cards.

  2. Capacity − CompactFlash cards are available with different storage capacities ranging from 8GB to 512GB. This makes them perfect for storing huge files like high-resolution photos or films.

  3. Durability − CompactFlash cards are robust and durable. They include no moving parts and are housed in a solid plastic housing.

  4. Reliability − CompactFlash cards are extremely reliable and have a low failure rate. They include features like Non-Volatile Memory, Error Correction and Wear Leveling. They do not have any moving parts that can fail or wear out; this feature makes them more reliable.

  5. Compatibility − CompactFlash cards are very reliable and have a low failure rate. They have no moving parts that could break or wear out.

  6. Power Consumption − CompactFlash cards are designed to be power-efficient, reducing the strain on the device’s battery.

  7. Security Features − CompactFlash cards have built-in security features like password protection and encryption to keep them safe from unauthorised users or unauthorised access.

Applications of CompactFlash Card

CompactFlash 卡在业界的不同领域被广泛使用。一些最常用的应用领域如下：

CompactFlash cards are most widely used in different domains of the industry. Some of the most commonly used application areas are as −

  1. CompactFlash cards are most widely used in digital cameras and camcorders.

  2. CompactFlash cards are used for video recording.

  3. CompactFlash cards are used in portable music players and personal digital assistants (PDAs).

  4. CompactFlash cards are used in data logging and machine automation.

  5. CompactFlash cards are used in healthcare to store patient data and images.

  6. CompactFlash cards are also used to back up important data as a Data Backup device.

  7. Because of their endurance and capacity to tolerate severe temperatures, CF cards are employed in aerospace and military applications for data storage and transfer.

  8. CompactFlash cards are used in entertainment systems also to store media files.

  9. CompactFlash cards are used in scientific research to store research data.

  10. CompactFlash cards are also used as environmental monitoring devices to store data collected from various sensors.