Saved Files Disappeared from my Sandisk Cruzer Slice 32GB when Previously There

My Micro SD card is 32GB and I wiped off everthing but I see 1.29gb used on a 29.8 GB SD card which now leaves 28 GB This is normal I looked into it and there’s no files in there at all just pre made folders as soon as you insert it into any portable device companies do that it’s never the full 32GB stored that you can use and there’s always system properties left which take up few gigs and you cannot access these files, I also thought I had few pics left in there but I manually looked into each folder from computer and also inserted into phone to see if there is any but none showed up.Upon making the USBs and HDD the tiny motherboard holds few important data to make it run which takes up few GBs.