• I have a mid-2009 13' MBP (2.26, 4 gigs, 1TB HDD, SL 10.6.4) and the SD card reader is not recognizing any of my SD cards (won't mount and also not seen in Disk Utility). The cards are recognized when using a USB adaptor, and also work fine in my wife's MBP SD card reader, so I know it's not the cards.
• Resetting the SMC on an iMac, Mac mini, or Mac Pro. Shut down your Mac. Disconnect the power cord. Press and hold the Power button for 5 seconds and release. Reconnect the power cord and switch the Mac back on. Check for updates. Outdated firmware and software results in various hardware issues, including. Yep — Mac USB ports not working.
• If the USB flash drive is not detected on other computers or if other USB devices are working properly on this Mac then most likely the USB drive is not functional. If the USB drive appears non-functional per the above troubleshooting, please contact SanDisk support for further assistance with warranty.
• Instructions to possibly fix your SD card reader on your MacBook Pro. My laptop would not read any SD card even after using blowing compressed air and this m.

Summary

Prior to that, the Mid 2010 models have one Secure Digital card slot and prior to 2010 the Mac mini has no card slot. Back side of Mac mini (Late 2014): If the flash memory card is a micro card, then to use the SD/SDXC card slot, you need an SD card Adapter as shown in the example image below. If you do not want to use the SD card slot then you.

Many Mac and MacBook users find that their SD cards are not showing up when they have inserted them into the devices. Why? In this essay, we will talk about the reasons and the solutions to this problem.

Content

Many issues can lead to a SD card recognize failure on Mac and MacBook. Here are some main reasons:

a. Poor connection： the contacts on the SD card are not clean; the card reader or the USB port is covered by dirt.

b. Unsupported file system: the file system of the SD card cannot be supported by Mac OS.

c. Data damage: the data on the SD card is damaged because of virus and file system corruption.

d. Physical damage: the chip is worn out, sapped or distorted.

How If SD Card is not Showing up on Mac or MacBook?

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First we need to check your Finder preferences and ensure external disks are set to mount to your desktop.

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With the Flash Drive connected to the USB port of your computer:

1. Click Finder in the upper left corner of the screen and select Preferences
2. Ensure the check box next to External disks is checked

If the Finder preferences are set to mount external drives to the desktop we will need to determine if the USB flash drive is detected by the computer

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1. Double click the MAC HDD
2. Double click Applications
3. Double Click Utilities
4. Select System Information
5. On the left side selectUSB

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If you see Flash Drive listed under the USB hub the USB flash drive is detected properly. You can verify is the drive is mounted by Selecting 'Go > Go to folder' from the file menu and typing /Volumes/ (Note: This is case sensitive). This will open the mount point for all drives connected to the Mac computer. You should see the drive mounted here.

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If the USB flash drive is not listed under USB hub please verify other USB devices work properly and if possible test the USB flash drive using a different computer.If the USB flash drive is not detected on other computers or if other USB devices are working properly on this Mac then most likely the USB drive is not functional.

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If the USB drive appears non-functional per the above troubleshooting, please contact SanDisk support for further assistance with warranty.