Size on disk vs size - data copied from Android

I need some help. I recently switched the ROM on my Android phone and copied all the data before hand from my phone's internal storage to my local HDD on my laptop. Successfully changed the ROM but when I tried to copy the data back, I found that I can't because the size is 1.47PB when the size on disk is 17.5GB. I've tried to compress it and to defrag it but that lead to nowhere