Network drive dissapeared!?!

[running1078]

Hi, I have a big problem, all the data on the network drive has disapeared, its funny because the backup data on another server is gone too (this was all the files of the users in the office but its only specific drive that is gone, like all of the email backups are still there... and the c: drive was changed to e:.

Thanks for any help and suggestions on what might have caused this.