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Disk utility gives a map of connected devices, provides simple partition repairs, allows the initializing, imaging and formatting of partitions and creation of encrypted folders.
If you want to see details of hardware/software, you need to browse the system report. Access it either from the apple icon at top left corner of the desktop or applications/utilities. All usb info is there, including details of connected devices. Your kobo may possibly be listed there in the usb port section, even if not showing on the desktop.
I expect that your finder preferences are set to show mounted devices?
Many people end up frustrated with the Finder limitations. There is a free version of Forklift in the mac app store. This is a dual paned file manager that among many other options, has easy show/hide hidden files. There are other similar file managers - dcommander, xcommander etc.
What model is your mac?
If you have ruled out cable issues, the next thing is to hard reset the computer. Switch off all power to the mac (remove plug from power point) and wait at least 5 minutes - assuming it is an iMac.
Check the system logs for info - everything is logged. Console is in applications/utilities.
Try the free app tinkertool to do various checks. Don’t tinker too much, or you will end up like me - having to restore a backup. On the other hand, you end up learning a great deal. Nothing concentrates the mind like a non stop blinking apple logo and the disastrous reality of one’s intrepid foray into roads unknown. Which is mitigated by the knowledge that you wisely clone/backup each day and in a few minutes all will be well again.
Another thought .. connect an external drive, install OSX on it. Reboot into that new install. Connect the kobo. If the problem persists it is likely hardware rather than the OS. This is one way I check my systems. I have several clones, known good ones. I boot into them to troubleshoot issues.
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