freebsd 4.11 cannot install

[Mrad James Deane]

hello i'm tryin to install freebsd 4.11 without succes.
After configuring my kernel and starting to sysinstall the systems stops 
while detecting hardware in this section (this is the default message shown)

ad0:Read commad timeout tag=0 serv=0 -resseting
ata0: resetting devices.

i don't know what to do to solve the problem i know that the problem come 
from my hard drive because i have done several operation on it (partitions, 
ntfs/linux format) but i'm in trouble i have succesfully install freebsd 5.2 
and 5.3 release with another partition that handle winxp .
please help ,
thanks
James Snipes

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