Whenever the SD card is connected to the Mac system via card reader or SD slot, it will show up in the Finder, Disk Utility, or desktop. When Mac users do not see the SD card shows up in any of the given locations, it means it is not set up correctly. Besides, there can be various reasons for the SD card not showing up on Mac devices such as Viruses, Malware, corrupted SD card, and damaged card reading slot.

Quick Check on SD Card
Before proceeding, there are a few small checks which also can be performed by Mac users which are fast and effective to the SD card not showing up on Mac issue:

Wipe the SD card with a clean and dry cloth to remove any dirt, dust, or grease.
Try another SD card reader or slot to check if its working or not.
Suppose that you are using a microSD, make sure to unlock it safely.
Make sure the contact points of the SD card are correctly position and facing down before inserting it into the SD card slot on the Mac device. SD slot can be thin and wide, so Mac users must be careful when connecting the SD card.
Most importantly, there can be a high risk of data loss from SD card when you are fixing the issue. Therefore, to prevent permanent loss of data, we suggest you go through together the steps below to recover all essential data from the SD card by using the reliable and free Mac data recovery tool.

Recover ‘SD Card Not Showing Up Mac’ with Mac Data Recovery Tool