Why on earth.. was there confidential info stored on a PC?
When will people learn? Data stays on the Servers... if it's on the workstations it can get lost, stolen or corrupted.
What's the point in spending £x,xxx on big, multi redundancy, file servers and SANs if you're going to hold databases or spreadsheets on PCs?
last point... who on earth lets a HDD out their company without first at least wiping it? Give it a once over with a low-level formatter or at least give it a windows format.