If you’ve got a PC or laptop, it’s worth connecting and seeing if you can access the files through another device. It could be that you are trying to connect something only fit to interact with Windows devices. Not every external drive is optimized for Macs. Restarting your Mac essentially clears your macOS’s memory and starts it up fresh. Or press and hold the power button and, when a dialog box appears, click Restart or press R. Hopefully, some data damage can be fixed by restarting.
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.
Repair the failed external drives with First Aid.How to show connected devices in Finder.How to fix new hard drive not showing up in Finder.How to fix an external disk drive that won't show up on a Mac.