You essentially created a RAID1 array when you said yes to creating a recovery drive. You need to remove the two drives from this array. You will hopefully still be able to boot from the C: drive, but the contents of the D: drive are gone (wiped out by the recovery image). Once you have removed the drives from the array, you will need to delete any partitions that appear on this D drive and then create them anew.
Hope this helps,
The age of your computer can make a difference to what you need to do...