There are significant differences between a card reader and a USB flash drive in a number of ways.
Form and structure: A card reader usually refers to a device built into a computer or other device to read memory cards, such as SD card readers, CF card readers, TF card readers, etc. They usually don't have a storage function and just read the data from the memory card into the device.
A USB flash drive is a portable flash storage device, usually in the shape of a plug, which is suitable for connection with various computers, mobile phones and other devices.
Scope of use: The application scope of the card reader is mainly to read and transfer data from memory cards, and it is usually used as an external device for computers or other devices.
A USB flash drive is a portable storage device between a memory card and a hard disk, which is suitable for file backup, data transfer, and as a boot disk.
Storage medium: The storage medium of the card reader is usually various memory cards, such as SD cards, TF cards, CF cards, etc.
The USB flash drive uses a flash memory chip as the storage medium, which usually supports more storage capacity, and is more robust, drop-resistant, durable, etc., and is more secure than the traditional mechanical disk.
Capacity & Speed:
Card readers usually do not have a storage function, and its speed and capacity depend on the make and model of the memory card.
U disk has a capacity choice from a few megabytes to tens or even hundreds of g, and the speed is also fast and slow, with the continuous progress of technology, the storage capacity and transmission speed of U disk are getting higher and higher.
Card readers and USB flash drives are fundamentally different in terms of morphological structure, scope of use, storage medium, capacity and speed. In practical applications, we need to choose products that suit our own needs to use.