I use an (Mac OS - journaled formatted) external Lacie harddrive to back up my Macbook Air via Time Machine (The external harddrive also contain other data besides my backups). The OS is Mountain Lion, and I have chosen to encrypt my backups in the settings from the Time Machine preferences.
The backup initiates automatically when the two devices are connected, and I had to interrupt it because I needed to leave, along with the Mac. I did so, by cancelling the backup, waiting a couple of seconds, but seeing as the backup symbol kept spinning, I pulled the cable and hurried of with the machine.
Now the external harddrive will not mount when connected. It is visible in Disk Utility, but cannot be activated. When you unplug the cable (thereby disconnecting the external harddrive) it suddenly asks for the password to the external drive.
I gather that something went wrong during the cancelling of the backup, where it was encrypting.
Can I somehow lift this encryption-gone-wild and get access to my data again? Thank you very much