Batch script copy files from USB to HDD

I need you to write a simple .bat file. This bat file will auto copy files from USB to HDD. It will copy all .doc or .pdf and .ppt files present in the usb device (in folders and sub folders) to /MyDocuments It will check the assigned letter for the device and do copy if exist. exemple : if D E F G H I J K L M N O P Q R S T U V W X Y Z is present => do : copy (*.doc, *.ppt, *.pdf, *.xls) FROM USB to C:/MyDocuments else do nothing and quit ___________________________ thank tou