Can a Second Domain Controller, with buggy hard drive hardware, cause a corruption to Active Directory?

view full story

http://serverfault.com – We have a new Domain Controller that holds all FSMO roles. We also have two old hardware servers, about 4-5 years old each, set up as secondary Domain Controllers. My question is do I run the risk of corruption in Active Directory if I have a drive failure, due to old hardware, on one of the secondary Domain Controllers. I am really trying to convince the client to buy a new hardware based server for our second Domain Controller but again budget is tight. Thanks. (HowTos)