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Please find your questions below, if your problem is not listed, kindly contact us at

01. What does CPRM mean?

It stands for Content Protection for Recordable Media. The SD card is equipped with content protection technology (CPRM) for recording media developed and provided by 4C Entity, LLC which is a licensing organization established by IBM, Intel, Panasonic and Toshiba. This technology is enabling a commercial content distribution system for music, video, etc.  
CPRM has been implemented on all SD cards so far, but it was an option in the SD standard Version 6.1.


02. What should I do if the cards are detained by customs?

First, please check if the logo printed on your device / outer box / package has followed the rules of SD association, if not, please contact the manufacturer.

Second, please check if the logo printed on the memory card has followed the SD logo guideline, or simply contact us if the cards were bought from us./ outer box / package has followed the rules of SD association, if not, please contact the manufacturer.

03. Why does the actual capacity slight less than the volume written on the specification?

The flash memory manufacters calculate one megabyte as 1,000,000bytes, and one gigabyte as 1,000,000,000bytes. As for computers a megabyte equals 1,048,579bytes and a gigabyte equals 1,073,741,824bytes. Also, the device takes some capacity away when it's working.

04. Whats writing speed and reading speed?

Read & Write speeds are simply a measure of performance on a storage device. You are able to test the read/write speeds for all sorts of storage devices, whether they’re internal or external hard drives, solid-state drives, USB, SDs, CF’s etc... you get the idea.

When checking the READ speed, you are looking at how long it takes to open (read), something from the device.

The WRITE speed is the exact opposite, you are determining how long it takes to save (write), something to the device.

Read & Write speeds are recorded with the letters “p/s (per second)” at the end of the measurement. For example, a device that has a write speed of 32 MBps means that it can record 32 MB (megabytes) of data every second.

05. Whats the difference between SD/SDHC / SDXC card?

There are three standards for capacity:

SD standard - Up to 2GB SD memory card using FAT 12 and 16 file systems
SDHC standard - over 2GB-32GB SDHC memory card using FAT32 file system
SDXC standard - over 32GB-2TB SDXC memory card using exFAT file system

06. Why do I get "The disk is write-protected" message when I'm trying to transfer files to my SD card?

Please make sure the write protection switch is on the correct position. If the problem still exists, please kindly take the product with the receipt back to the original retailer and ask for a repair or replacement service.

07. How many number of pictures can I store in my card?

It depends on few things:
Resolution of the sensor
Camera model and file settings
Compression settings for JPG if used, optimal or size priority.
Common format of picture storage we have seen in our daily life are:
EPS、RAW、BMP、TIF、PSD、JPEG, each of them takes different space in your memory card per pictures.
If you chose to shoot in JPEG format, there are also multiple quality options—like extra fine, fine and standard—that produce different file sizes.
So, how do we determine how many pictures a memory card can hold? It depends on more than one factor to make an accurate calculation.

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