An example of the above command:
# iostat -En
c8d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Model: ST3160215AS Revision: Serial No: 6RA Size: 160.04GB <160039305216 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0
c7t0d0 Soft Errors: 0 Hard Errors: 9 Transport Errors: 0
Vendor: PLEXTOR Product: DVDR PX-712A Revision: 1.09 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 9 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c10t0d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: WDC WD40 Product: 0LB-07DNA2 Revision: 7B79 Serial No:
Size: 40.02GB <40020664320 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 76 Predictive Failure Analysis: 0