Empty folders

help me friends,
I m having trouble with my pen drive 64 gb THOSHIBA .problem i see with pen drive is whenever i copy files to pen drive all copying is done and when i remove it safely and re plug it shows some of folders are empty. but capacity is taken when check pen drive properties. then all select (ctrl+A) folders, and check capacity, it shows , less capacity
an example Pen drive used capacity = 15 GB , but all select (Ctrl +A ) capacity = 2.05 gb like that. im using win XP OS

attrib -h -r -s /s /d g:\*.* is not working

THANKS.
udith