what are cirtical errors come if the hard drive will crash

Hi,Which disk you are talking about, Its depend upon file location as DB or LOG file in exchange. But for any disk failure where ever exchsrv located store will be dismount.Please have a look if below KB for complete error message and symtompus if disaster happend on exchange 2003Exchange 2003 Disaster Recovery Operations Guide::http://technet.microsoft.com/en-us/library/bb125070(EXCHG.65).aspxAnil

Here are some 474, 11, 1500 , 1508, 5031 and list continues..Raj

You will notice the critical alerts in system log/Application Log and logs are self explanatory. So MS recommend that keep the Database and Logs on separate RAID drives so that you can recover them at any given point of timeVinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Hi. Mr AnilThanks for your valuable replay