If you can use the device now, the problem may be with one of the other USB devices or hubs you had connected to your computer. Make sure that the device is connected directly to the computer, and that any hubs or extension cables are disconnected. * If you have many devices connected to your Mac: Disconnect all USB devices except the device you’re testing, an Apple keyboard, and an Apple mouse. You might need to disconnect and reconnect the other device as well, if it has stopped responding. ![]() * If the device doesn’t have a power cord and is plugged into another USB device that doesn’t have a power cord: Try plugging the device directly into your computer’s USB port or into a USB device that does have a power cord. Connect USB 3.0 SuperSpeed devices to a USB 3.0 SuperSpeed HUB, USB 2.0 Hi-Speed devices to a USB 2.0 Hi-Speed hub, and so on. * Check the USB hub: If the device is connected to a USB hub, make sure the device and the hub are the same speed. Visit the manufacturer’s website for any updates. * Check for missing software: Make sure you installed the latest software for your device. See Find out how to service or repair your Mac. * If you still can’t use a device with the port, your computer may need to be serviced. Wait about a minute, then plug it back into the power outlet and start up your computer. If you can’t use this device, shut down the computer and unplug it from the power outlet. * If you can use the device after switching ports, connect another device to the first port. If you still can’t use the device, contact the manufacturer for more information. If your computer has more than one USB port , switch the device’s cable to another port. * Check the power, port, and cable connections: Make sure the USB device is turned on and its cables are properly connected. We'd also recommend confirming the firmware for the Sandisk is downloaded to help your Mac see it, if applicable. What this includes are steps to make sure that your Mac is connecting and seeing the external. If you haven't yet, we would recommend reviewing the troubleshooting found at If a USB device doesn’t work with Mac - Apple Support. Recover data from logically damaged hard drive, external hard drive, USB flash drive, memory card, CF card, etc.Having your external hard drive working is definitely important. Recover data from corrupted partition, hard drive, external hard drive, USB flash drive, memory card, CF card, etc. Recover data from inaccessible partition, hard drive, external hard drive, USB flash drive, memory card, CF card, etc. ![]() ![]() Recover data from RAW partition, hard drive, external hard drive, USB flash drive, memory card, CF card, etc. ![]() Recover data from formatted partition, hard drive, external hard drive, USB flash drive, memory card, CF card, etc. Recover data from deleted or lost partition Recover deleted files even if emptied from Recycle Bin It goes deeper than any other data recovery software, which guarantees the efficiency of file recovery. IBoysoft Data Recovery is a free, effective and none-destructive data recovery software specialized in deleted file recovery, format recovery, RAW drive data recovery, lost partition recovery to get back all lost files fastly in Windows 10/8/7/XP and Windows Server 2012/2008/2003.
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