My laptop HP Pavilion Zd 8000.3.20 ghz 1 gb ram 100 gb hard drive. Why when i try to move a 6.7 gb avi file from main c drive that has 34 gb free, to my external Lacie 297 gb drive do i get a error message .ERROR COPING FILES .not enough free disk space delete old files . which drive is it relating to ? I assume it is the c drive that has 34 gb free ,34 - 6.7 =27.3 ??