what is bitlocker writing, after copying file?

When I transfer a 1gb file, bitlocker keeps writing something to the drive.

looking at the graph, you can see it taper off.

in constrast, with bitlocker off, there is no taper off.

what is bitlocker writing after the file has already been transferred?

Does bitlocker encrypt on the fly, or encrypt after a file has finished copying?

Does bitlocker write double the data? thereby using up an ssd's life sooner?


with bitlocker...



without bitlocker...