My HTC 516 dual SIM's memory bar was showing a white portion which as per the color codes means... NOTHING!!!

That white part is taking almost half of the memory therefore it is running out of memory in no time.
I just did a hard reset but still I'm getting the same.
What is that white part used for?
Can I solve this so I can use the full available memory?

Screenshot here...

See More: HTC 516 memory trouble