Try connecting the same device with a different cable. Assuming it’s plugged in correctly, not wobbly or loose, the cable could be at fault. Check whether the drive is properly plugged in. It sounds obvious, but since this relies on a wire - either a USB cable or HDMI cable - if it’s not connected properly then it won’t appear on your desktop.While it’s impossible to instantly figure out why an external disk drive is not showing up, you have to try to fix the problem.
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How to fix an external disk drive that won't show up on a Mac Your drive has been corrupted or broken.There could be a few reasons why SSD isn’t making an appearance (just as any other external drive), the most common being: Let’s say you’ve encountered the problem of SSD not showing up. Why your Mac does not recognize external hard drive How to make Ext2/Ext3 drives readable on Mac.Alternative ways to recover data from an external hard drive.A few more tips on getting your files back.An easy way to recover lost files on an external hard drive.How to recover data from a crashed drive.