macos - How can I remount an ejected (not just unmounted) USB drive on Mac?

I frequently eject an usb stick, and then realize I still need it.

If I unmount the drive in Disk Utility, I can just remount it, but if I eject, it's gone.

• Not showed in Finder


• Not showed in diskutil


• Not showed in ls /dev


• Is still showed in System Information under USB.

How can I mount the disk without unplugging and inserting it?

Answer

You can remount an ejected hd using "hdiutil attach" and the appropriate /dev/ device (the BSD name under System Information). As you said, this does not work for flash drives (the /dev/ device will disappear).

kextunload IOUSBMassStorageClass.kext;
kextload /System/Library/Extensions/IOUSBMassStorageClass.kext

Will unmount and remount all USB storage devices...