Firmware updates address a variety of hardware issues and the functionality of the USB ports could well be one of them. MAC OS X BOOT DISK NOT FOUND UPDATE4 Update Your Mac’s OS and FirmwareĬhecking for updates may be one of the easiest ways to open USB ports on your Mac. Failure to eject a USB drive before pulling it out of the port can cause the OS to view the port’s status incorrectly and may impact its ability to be identified and accessed. MAC OS X BOOT DISK NOT FOUND MACIf your Mac is having problems identifying a flash drive it may be that you did not properly eject a drive that was previously connected to your machine. The solution here is to try connecting the flash drive directly to the computer’s USB port or employing a self-powered hub that eliminates the power drain on your machine. Your Mac or MacBook may not be supplying enough power to adequately service all of the devices. This is especially prone to happen if you use a bus-powered USB hub and have multiple devices connected simultaneously. Your flash drive may not be registering with your Mac due to an issue of insufficient power. If it will not work on different Macs then it is likely that there is a major issue with the device. If another Mac is available, try connecting the flash drive to it in order to verify that the USB drive itself is not the culprit. However, if the drive doesn’t work in any of your USB interfaces you need to look further to determine the problem. If the device works in the second port it indicates that the first port may be damaged and may need to be replaced or repaired. At the risk of stating the obvious, your first move should be to try the device in an alternate USB port available on your machine. The first thing to check if your thumb drive is not showing up on a Mac is if the problem is with the particular USB port that you are using. Hopefully, this simple fix will be all it takes to get it to work. Once your Mac is done booting up, try accessing your USB flash drive again. MAC OS X BOOT DISK NOT FOUND WINDOWS
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