No , I don't want to go that far. I just want to know the answer of these questions. 1. where is harddisk controller located ? is it on harddisk or is it in IO Card ? 2. In my IDE Controller there is primary , secondary (both with master and slave) , if I have 4 harddisks and I put them all on the IDE Controller . Does it mean I have four different harddisk controller and can have better performance if I put in one of them ? -----Original Message----- From: Stephen Hartley [mailto:shartley@xxxxxxxxxxxxxxxxx] Sent: Monday, November 11, 2002 10:35 AM To: [ExchangeList] Subject: [exchangelist] RE: raid in Exchange http://www.MSExchange.org/ You should be considering putting the whole lot in the hands of an experienced SBS2000 computer person. My suspicion is that you may be about to change the IDTENT settings - don't! Call a professional Stephen Hartley NetAbility Brisbane, Australia