This would be my vote but
Or at least, edit /etc/fstab so that you specify the nofail option for the µSD card mounting. That way you should be able to shut down and remove the card if something has gone pear-shaped, and the phone will then boot without complaining about problems with the card - assuming of course that you didn’t move anything critical to the µSD card.
Citation: Quick and Easy User Personas
It is CRITICAL that you add the
nofailoption to any microSD card-related entries in/etc/fstab, that way if you boot without the microSD card it will fail to mount but still continue the boot process. Without thenofailoption, the boot will stall and you will have to modify the file system from a remote computer to remove the mount point from/etc/fstab
Note that using Jumpdrive and fixing fstab from the host computer is one option - and probably the easiest in this case - but another option is using Jumpdrive and telnetting in to the phone and fixing fstab on the phone itself.