Oh no! Hard drive failures and data loss are just about the worst things ever. Believe us, we commiserate with you and want you to get your music back!
For assistance with this problem, you should contact Bandcamp (the site that hosts our music) directly via their email form. They can help re-authorize a download so you can get your music back.You can solve most other problems with your music downloads by visiting either Bandcamp’s Downloading FAQ or Bandcamp's Help Page.