The card is fine, but when you turn on the camera, it says "Memory card is locked".

The card is good, but when it is turned on, it shows that the memory card is locked, that is, the latch switch is not turned on. The latch switch is located on the side of the memory card, which can be unlocked by pulling down.

In addition, compatibility should also be considered. Just like DIY computer hardware, memory cards also have compatibility problems. There are also some incompatible problems between different brands of memory cards and digital cameras. Mainly manifested in the card reading time is too long, the access speed is longer, or there is a crash. So when buying a memory card, be sure to remember the memory card model corresponding to the machine. It's safer to try the machine yourself.

Finally, see if the card is deformed, concave and convex, cracked, etc. , which may lead to card damage.

Extended data:

Large-capacity memory cards are not suitable for all digital cameras, especially those introduced several years ago. The reason is that the former large-capacity memory card adopts FAT 16 format, while the latest generation memory card adopts FAT32 format, and the two formats are incompatible.

Generally, FAT 16 format can use FAT32 format, but FAT 16 format cannot use FAT32, which brings a lot of inconvenience to users. However, for ordinary digital camera users, it is enough to use 256MB and 5 12MB memory cards. If you need to take more digital photos, you can bring more memory cards. Although the reading and writing speed of large-capacity memory card can reach 40 times, its price is also quite expensive, which is mainly suitable for some professional photographers or digital camera users. ?

Baidu encyclopedia-memory card

People's Network-Pay attention to the format when buying large-capacity memory cards