1. How to use SD memory card correctly?
(1) When the battery power of your system is low, do not write a card to prevent data loss;
(2) In the state where the SD card is being read and written, please do not move the SD card or shut down the system, otherwise the product may be damaged;
(3) Do not contaminate the SD interface surface, do not format it frequently in the computer, and do not continue to use the SD card in a low-voltage state;
(4) Do not bend, fall or expose to the sun, otherwise it will affect the use effect of the product;
(5) Avoid radiation, moisture and static electricity.
(Zhongcheng Tianhe Data Recovery Center)
2. Can the SD memory card be inserted or removed when the device is powered on?
can. However, Smart Media may or may not work according to the specifications of the connector manufacturer.
3. How to solve the problem that the SD card is used to report card errors on the camera, or prompts formatting?
Use the camera or card reader to connect to the PC and try to format the SD card in Fat format. If it prompts that the format is completed, it will be repaired.
4. Why the capacity of the 128M card I bought recognized on the computer is less than 128M?
Normally the capacity we talk about 128M refers to the actual capacity of the chip, but in the process of producing low-level SD cards, the control system of the SD card should provide a part of space for managing memory (such as the space used for managing partition tables and creating directories). The following is a comparison list of available capacity of actual users of various types of SD cards:
Capacity 128MB 256MB 512MB 1GB
User area: about 122MB, about 246MB, about 493MB, about 982MB
5. I have been using the normal SD card in the camera and used it in the PDA once, and then I got it in the camera again. Why do I prompt to format it?
The storage format of the PDA is inconsistent with the storage format in the camera.
6. Is there any special structure for the SD memory card for music transmission?
In the path of downloading music, each path has a different password, and the SD memory card password (CPRM) is also generated when recorded on the SD memory card. At this time, the password will not be decrypted. In addition, a fee-paying structure (design) is also required.
7. How to define the read and write speed of SD card?
The current general calculation method: Calculate at the highest reading and writing speed, at double speed, 1X is 150KB / S. For example, 60X on the market currently corresponds to a maximum read and write speed of around 9MB / S.
SD Association Definition Specification: Calculated at the lowest reading and writing speed
Speed ​​level minimum read and write speed
CLASS2 2MB / s
CLASS4 4MB / s
CLASS6 6MB / s
I personally think that the definition of the SD Association is more scientific and reasonable to use the minimum reading and writing rate. After all, in most cases, the user cannot reach the so-called maximum rate working environment. A nominally so-called 60X high-speed SD card, if the minimum read and write speed is less than 4MB / sec, it is not a real high-speed card.
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