1. Memory card type
There are three common memory cards on the market, namely: SD card, TF card (Micro SD card), CFexpress card
(1) SD card
SD cards are the most common, and most cameras and card machines use SD cards.
The biggest feature of the SD card is that there is a write protection switch, the switch down dialSD card files can only be read, can not be written, the switch is dialed up, the protection state is lifted, can be written, copy files.
(2) TF card
There are many TF card use scenarios, such as: drones, action cameras, panoramic cameras, etc., and the car's driving recorder is also a TF card.
(3) CFexpress card
CFexpress cards are rare, only supported by some high-end micro-single cameras, and their transmission speed and performance are the strongest.
In addition, CFexpress cards are divided into three types, TypeA, TypeB, TypeC, and the CFe card commonly used on the market is a B-type card.
Second, the parameters on the memory card
Because the SD card is the most representative, so I made a picture with the SD card:
(1) Memory card capacity
The largest number marked on the memory card is the memory card capacity, which is usually 32GB, 64GB, 128GB, 256GB, 512GB, etc.
My personal advice is to try to choose 32GB or more, if you are often shooting videos or time-lapse photography, etc., it is best to choose 128GB or more.
(2) Read and write speed
Memory cards have two speeds of reading and writing, generally speaking, the reading speed is greater than the write speed, so the number style of "170MB/S, 150MB/S" on the memory card indicates the reading speed.
(3) Speed rating
There is a "3" logo in the "U" word, indicating "UHS speed level", U1 means the minimum continuous write speed of 10MB/s, and U3 means the minimum sustained write speed of 30MB/s.
The "C" has numbers in it, indicating the speed level, which is the earliest speed level, there are C2, C4, C6, C8, C10 five levels.
| grade | Minimum speed |
| 2 | 2MB/S |
| 4 | 4MB/S |
| 6 | 6MB/S |
| 8 | 8MB/S |
| 10 | 10MB/S |
Now basically no one looks at the C standard anymore, basically looks at the U standard.
(4) Video speed rating
The logo of "V+ number" is the video speed level, and the five common levels are V6, V10, V30, V60, and V90.
V6 indicates that the minimum sustained speed is 6MB/s
V10 indicates a minimum sustained speed of 10MB/s
V30 indicates a minimum sustained speed of 30MB/s
.........
But not all memory cards have this logo, if you shoot more videos, then this logo must have.
Third, the memory card brand
Common memory card brands are: SanDisk, Kingston, Toshiba, Panasonic, Lexar, Samsung, etc., which everyone chooses according to their own needs.
If you buy a channel, you can buy it directly to the official website, which is not too much to pay attention to, and the official channel can buy it directly.
And everyone must first see what kind of card their camera supports when buying a memory card, in the camera parameter column, where the storage medium will be marked clearly what type of memory card the camera supports and the camera manual will also be marked clearly.