Does dd read every possible byte from the SD card?

I have this damaged 16 GB MicroSD card which is hardly readable by a card reader (one of my two readers recognized it) and it shows up in the system as a drive with a single raw partition with 200-ish MB of space.

My idea was to mess with disk geometry with testdisk by increasing the number of cylinders, but everything beyond those 200 MB caused read errors.

Also, I tried to dd the desired number of bytes (16GB) from the device, but it gave me just those 200MB again.

So my question is, does the result of dd's work prove that those 200MB are all the space that survived, and there's no "software" way to make dd read more?

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