Cards that conform to the SD 1. The SD card slot can use: Desktops can transfer data at a faster rate. Check the packaging that came with your SD media to determine the maximum transfer rate that your specific card uses.
To determine the maximum transfer speed of your Mac, you can use System Information. When you insert the card, make sure that the metal contacts face down and point toward the computer.
You can mount, read from, and write to the SD card just like you can with any other USB storage device. Remove the card and insert it again.
You need to use the lock slider to unlock the card before you can edit the data. To eject the card, drag the icon that represents the card to the Trash.
SD card not mounting or seen in Disk Utility
After the icon disappears from the desktop, you can remove the card from the computer. Adjust the lock slider tab to unlock the card, then reinsert the card into the slot. When in doubt, format the card in the device that you intend to use it with. Then format the card to use the Mac OS Extended file format.
Won't recognize SD card inserted into MacBook · Issue # · balena-io/etcher · GitHub
Before you remove the card, allow any data transfer to SD media to complete. After the icon disappears from your desktop, you can remove the card from the slot.
Don't remove a card while your Mac is sleeping, as this could lead to data loss. Always wake your computer and eject the SD card before removing it from your Mac. If it doesn't show then it's likely the card reading slot isn't working. If it does show up, then the fault is with the Transcend card. Johann Gambolputty de Von Ausfern Thanks, nickyr. Yes, the Preferences are set to show all drives, and I tried blowing into the slot and even very gently cleaning the terminals, but no go. The SD card still shows up fine on my old machine, so it must be a problem with the slot or the circuits attached to it.
I'll contact the person I bought the machine from and see if he was aware although I doubt he'll say if he was! You might want to try checking the "System Info": Click the Apple top left menu as you would to see About this Mac but hold the option while doing so. In the resulting window you should see an option to select the "Card Reader" I believe, and see what it says and any card or info that might be listed.
You can also try inserting the CD card and if it doesn't mount, Restart your Mac and see if it then shows.
Many reasons may lead to an SD card not showing up on Mac issue, such as SD card corruption , system errors, virus, physical damages, or simply the card reader's issue. If the SD card isn't showing up in Finder but is showing up in Disk Utility on your Mac, you can follow the solutions below to fix the SD card and keep all the files safe. You have to send it to a local reparation company or simply replace it with a new one.
First of all, you can try to restart your Mac computer to check if the SD card can show up in Finder on Mac. If still not, don't hesitate to try out these solutions below. This will clear some settings that could lead to SD card not showing up on Mac error.
Reformatting an unmountable SD card gives this device an opportunity to rebuild the file structure and avoid using bad sectors if any. It is helpful to fix the SD card that won't show up on Mac. The only concern here should be the data on the SD card, as re-formatting will erase all the files.
About the SD and SDXC card slot on your Mac
If you did regular Time Machine backup, then you can recover from Time Machine. Otherwise, you need to firstly recover files from the unmounted SD card with reliable data recovery software, like iBoysoft Mac Data Recovery. Step 1: Launch this program. Select the SD card that won't show up on Mac and click "Next". The program will start scanning this SD card for recoverable files.