QUOTE(suntzulee @ Dec 10 2013, 02:40 PM)
i see. you mean around 5GB is the system files for kit kat? but the rom size is just less than 500mb...

oh yea, i played with the lock and unlock bootloader option in toolkit. At the end, the whole internal storage got formatted. Any way to recover it?
No, system file takes around 1GB only, this is because we use different calculation method when we talk about file size, one is decimal standard which measures a GB as a literal billion bytes (1,000,000,000). (16GB=16,000,000,000/32BG=32,000,000,000). Another one is binary which doesn't measure it that way. Binary measures in 1024 (1KB=1024bytes/1MB=1024KB/1GB=1024MB). In OS, it measures in binary standard. So you do the math and you should be able to get the result in binary standard.
Unlocking bootloader will wipe your data, no way to avoid it now so please make a backup before relocking or unlocking next time.