Deleted giant .thumbdata3-files (2 x 3GB) -> free space did not increase (Xperia Z1)

A

AC Question

Hello,

i had two giant .thumbdata3-files (more than 3GB each) in my sdcard/DCIM/.thumbdata folder.

I deleted them. Until now (1 day later) they didn't come back, but the space they used is still not free.

When i use a storage-analyzer app like "Drives" it shows that 10 of 12GB are occupied, but in the detail-view (where the cake-diagram is divided into portions by folder-usage) only 5GB usage is visible.

I deleted the whole .thumbdata folder, but the problem persists.

Those "ghost-files" are still clogging my phone.

I searched for this problem and one solutions seems to be to create dummy-files that have the same name like the .thumbdata3-files i deleted.
But my problem is: i don't know the exact name of the files (they end in a seemingly random number). I didn't write it down before deleting them.

Does anyone have a solution for this?

Note: it's a work-phone so i'd rather not root it. But if there is no other solution i'm able to do it.

Thanks!