Run Disk Utility to Mount, Verify, or Repair Drives.Update Finder Preferences to show external drives.
Connect the USB device to its own power source, if possible. Check your USB connections for a snug fit or frayed cables, missing pins. 
If using a hub, try using a different port on your Mac for the hub or plugging your external drives directly into the Mac. Quick Tips Follow these quick tips and get your Mac to recognize and mount your external drives When you wake your Mac up, for whatever reason, your external drive does not wake up. If you have a disk already mounted and your system goes to sleep, it also powers down ports, including USB ports. There are several reasons why your Mac won’t recognize a drive. In many cases, the only way to solve this problem is to completely remove the external drives and then restart your MacBook or Mac several times until the drives finally show up again. It won’t mount at all and acts as if it’s utterly invisible to macOS. This situation often occurs after you initially eject the external drive and unplug it from your computer. When you try to plug in the drive again, your Mac no longer sees it. On the white casing, you’ll need good light and good eyesight (or magnification) to read it.Sometimes our MacBooks, MacBook Pros, or Macs don’t recognize our external drives or external thumb drives. 
Yes, you can connect your iPad + Lightning to USB3 Camera Adapter to the USB hub - and if the hub is powered, then you can forgo use of the auxiliary Lightning connector on the adapter for power.Īs with anything iPad-related, increasing complexity of the connection tree also increases the possibility of compatibility issues.Īs for the markings on your white iPad Charger, they are typically printed in very small typeface - and in a very low-contrast shade of light grey. You would be well advised to ensure that both the hub and any connecting cable supports USB3.0/3.1 standards as USB2.0 is quite slow by comparison. Most readily available USB hubs will present physical USB Type-A connectors USB-C connectors are less common on anything other than the newest computers and mobile devices. It’s worth reiterating that whilst your drive may be formatted correctly, for compatibility with iPad, it must not have multiple partitions. If the problem with your external WD drive is due to inadequate power, then a powered USB hub may help.
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