Data delete after power off

thanks to read my message
after transfer my document and plug out my external hard " my passport 3.0 500 g.b " all data delete , plz help me

You may have disconnected the drive without doing a safely remove or eject.  If this is the case the data might  be corrupted, to get it back you may use a data recovery software like recuva.

thank you too much for your advice , i solve the problem , i use a shadow user program " just like a deep freez " , and this program deal with the external hard as a Part  of partation C which I Freez it , any way thank u too much for your interest