PLEASE HELP - Failure reading the filesystems file (err=1)

I ran the CHKDSKand received the following message:

Access Denied as you do not have sufficient privileges o rthe disk may be locked by another process.
You have to invoke this utility running in elevated mode and make sure the disk is unlocked.

This is my entire computer backup and in day of getting this message and purchasing a new drive and unfortunatly not receiving it for a few day, the following day my Mac Harddrive failed and now both the hard drive and back up will not work.  Please help.  Not sure how SanDik does not have a way to recover any of my data.