This mod from Strikor allows you to drop the flashdrives for later use.
Stashable/Droppable Flash Drives by Strikor
This mod allows you to store upgrade flash drives in a stash or dump them on the ground. Various killing sprees will no longer leave you with drives taking up inventory space for the rest of the game.
To install, simply extract the gamedata folder to your Clear Sky directory. If you haven't already, open up fsgame.ltx in the same directory with Notepad and make sure
$game_data$ = false| true| $fs_root$| gamedata
is set to
$game_data$ = true| true| $fs_root$| gamedata
Removing upgrade_items.ltx will uninstall the mod.
Please include credit to me if you use this mod in your own work.