Unless the drive can be accessed you won't be able to recover any data from it, not even with data recovery software.
You could try putting the drive in to a different enclosure, but I believe the drive itself is damaged.
Regarding data loss - - I am always telling people never to rely on just one hard drive. You should have saved identical copies of your data on at least two hard drives. I use four external hard drives to save identical copies of my data.