Hi CharlesLeung888,
Dear member of SanDisk Community, welcome.
Please friend, do not grieve more, return it, is defective.
See link, and you might have a pleasant surprise: http://www.sandisk.com/about-sandisk/contact-us/
To obtain, the internal data card, you can use the utility (free): USB Flash ChipGenius 4.00, http://filecloud.io/rqa7etmv
To find out more on this, see here:
Luck.
Regards, Alfred. (Google translated)