In this situation, you can recover data from it first, then click on Erase option to wipe all data and reformat it.
#Mac usb ports not reading mac#
Or the USB drive is using a file system that Mac cannot read. 4K HDMI, USB C and 2 USB A Data Ports, SD and microSD Card Reader. If your Mac does not repair the inaccessible USB drive successfully, there is a chance that your USB drive is damaged or broken.
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I would also boot into recovery mode just to see if the disk pops up in Disk Utility via both ports - that could indicate the port is being rendered useless by the OS.Īpologies, you appear to have tried that already. Massive Expansion: Expand your MacBooks 2 USB-C ports into 1 Thunderbolt USB-C port. You may want to get the genius to confirm the spec for both ports if you go along to a store, I guess they may have limitations. Plug in the disk & view the System Information Apple menu > hold alt on the keyboard, select 'System Information'. A device may draw a maximum of five unit loads (500 mA) from a port in USB 1.x and 2.0, or six unit loads (900 mA) in USB 3.0. I wonder if the right port is providing too little power, external disks often require more power than a USB flash drive.
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#Mac usb ports not reading pro#
Resetting the SMC on an iMac, Mac mini, or Mac Pro Shut down your Mac. Boot up your Mac as usual, and the SMC will be reset. It doesn't make sense to me that a 'low power' USB port would output 500ma unless it was working in USB2 mode.Ī unit load is defined as 100 mA in USB 1.x and 2.0, and 150 mA in USB 3.0. Press the Power button while holding all three keys. If you have a NAS drive that connects over the network then you should read. Additionally, there is a Battery Charging Specification (Version 1.2 – December 2010), which increases the power handling capability to 1.5 A but does not allow concurrent data transmission. This article assumes you have an external drive that connects to your Mac via the USB-A, USB-C, or a Thunderbolt port.
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According to the fount of knowledge that is Wikipedia…Īs with previous USB versions, USB 3.0 ports come in low-power and high-power variants, providing 150 mA and 900 mA respectively, while simultaneously transmitting data at SuperSpeed rates.