The real_cordon_flash_drive_fix.7z file you have requested: Clear Sky / Mods / Singleplayer / Real Cordon Flash Drive Fix - 2.67kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Clear Sky and upload any files you want to share or are missing. This is the only information we could locate:
This mod allows the player to obtain the third and final Cordon flash drive by rescuing Wolf's brother from captivity. Wolf will give it to the player as a reward.