Pny attache 4 16gb usb 20 flash drive specifications features usb 20 and 11 compatible data retention 10 years writeerase cycles 10 000 minimum case colour black data storage life 10 years enclosure type portable form factor flash drive in the box pny attache 4 usb 20 flash drive interface 1 x usb 20 interface type usb marketing pny attache 4 16gb usb 20 flash drive memory size 16 gb operating systems