To learn how much power a drive requires, connect it to your Mac, open the System Information app (in the Applications folder’s Utilities folder), click USB in the sidebar, select the drive in the USB Device Tree at the top, and then read the Current Required line. Happily, flash drives that require only 100 mA of power work fine without additional power. (Avoid Apple’s older $29 Lightning to USB Camera Adapter, which supports only the slower USB 2 and doesn’t provide passthrough power.) That passthrough power should usually be enough to charge the device and run the flash drive, although we’ve seen flash drives that work with the iPhone 11 Pro but not with a 10.5-inch iPad Pro. You’ll need to provide extra power by plugging a standard Lightning-to-USB cable into the adapter and a power source. When that’s the case, iOS will usually alert you to the problem (or the drive simply won’t show up in Files).
There is one big gotcha, which is that many USB flash drives require 500 milliamps (mA) of power, which is more than the iPhone or iPad can provide. For the USB-C iPad Pro models, any USB-C hub with a USB-A port should work. Or, if you have a 2018 iPad Pro model with USB-C, get a USB-C flash drive.īut what about all those USB flash drives and hard drives you already have? To connect those to a Lightning-based iPhone or iPad, you’ll need Apple’s $39 Lightning to USB 3 Camera Adapter. Apple’s MFi program should ensure that drives with that label meet the necessary power and file system requirements. If you plan to use a flash drive with an iPhone or iPad regularly, it’s worth buying a new MFi Lightning flash drive that you can plug in directly. If you’re formatting a drive for sharing with a PC, we recommend exFAT for use within the Apple ecosystem, use Mac OS Extended. IOS should be able to read any unencrypted file system supported by the Mac’s Disk Utility, including the PC-focused MS-DOS (FAT) and exFAT, and the Apple-focused MacOS Extended (HFS+) and APFS. (You’ll still need an app on the iOS device that knows how to open the files-for videos, try VLC for Mobile.) It’s also a great way to play videos and other data that won’t fit in the available free space on your device. That’s huge-now you can move data to and from an iPhone or iPad using standard flash drives, SD card readers, or even powered USB hard drives. With this feature, the Files app now can “see” external storage devices.
An unexpected and useful feature of iOS 13 and iPadOS 13 is also nearly invisible, and for most uses, requires a special adapter.
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