Capacity flash memory products are generally shipped according to 1mb = 1000kb, 1g = 1000mb computing, but the operating system using binary arithmetic 1mb = 1024kb, 1gb = 1024mb, so there are some differences between the display capacity and the standard capacity memory products. 8gb = approximately 7.4gb-7.8gb 16gb = approximately 14gb-15gb 32gb = approximately 28gb-30gb 64gb = approximately 58gb-59gb 128gb = approximately 110gb-120gb 256gb = approximately 230gb-240gb This is calculation difference between manufacturer and our computer, please google memory card capacity. for more information. Usb flash drive is multifunctional (for) iphone flash drive. Asily transfer photos and videos between (for) iPhone, iPad, Android computer and Mac computers. For the first time use on iphone ipad, you need to install app. (Auto App Identification) or please search and download the app (y-disk) from the app store for free. Android device usb c and pc plug and play does not require app installation USB flash drive is a very easy to carry external USB memory stick drive. Compatible with the latest iOS devices iPhone iPad Mac Android PC and iOS8.0 and above system version., no more angry warning message. The USB thumb drive applies to the 5S/6/7/8/s/Plus flash drive of iPhone X XS XR Max iPhone 11 Pro iPod iPad Mini, Macbook Window PC and so on external storage drive. due to internal system and procedure data will occupy some space and the actual capacity will slightly reduce. The USB thumb drive applies to the 5S/6/7/8/s/Plus flash drive of iPhone X XS XR Max iPhone 11 Pro iPod iPad Mini, Macbook Window PC and so on external storage drive. due to internal system and procedure data will occupy some space and the actual capacity will slightly reduce.