The trash for the pendrive is stored in a hidden .Trashes folder on the pendrive. Therefore, initially moving a file to Trash will not recover the space on the drive. Emptying the trash will delete items in the trash on all mounted volumes, including the pendrive. That is when you will see your recovered space. That feature is by design in OS X.
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Answer by fideli for Delete the pendrive contents and also trash in Mac OS X?
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