Remount drive without physically disconnecting? So I have unmounted a usb external hard drive but I went to re-mount it.  Is there a command that I can use to remount the drive?  Only way I know to re-mount a drive is to disconnect the usb cable from my Mac and reconnect it.
One-liner:

diskutil mount `diskutil list | grep "Volume Name" | sed -n -e 's/^.* //p'`





Find the disk identifier:

diskutil list | grep "Volume Name"


Example result:

4:   Apple_HFS Volume Name   100 GB   disk1s2
Mount the disk:

diskutil mount disk1s2