Galaxy S3 encryption issues

I have set a 6+ characters password, and I have encrypted the 2GB SD card and ATT Galaxy S3 device. But I am able to read and write files to the card and device using the computer. How is this possible? Does Encryption on S3 works differently? I thought the SD card and the device would show some warning messages or would ask for a password.

Source: http://android.stackexchange.com/questions/39383/galaxy-s3-encryption-issues

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