ata problem !!

[Dani Popa]

hi all,
my freebsd not recognize ata hard-disk. i have 3 scsi hard-disk and 1 ata hard-disk. After i make buildworld and build/install kernel and install world my freebsd don't recognize ata hard-disk.

before install new kernel some dmesg:

Timecounters tick every 10.000 msec
Interrupt storm detected on "irq10: uhci0"; throttling interrupt source
ad0: 28629MB <WDC WD300AB-00BPA1/18.20D18> [58168/16/63] at ata0-master UDMA33
Waiting 15 seconds for SCSI devices to settle

after install new kernel some dmesg:

Timecounters tick every 1.000 msec
IP Filter: v3.4.35 initialized.  Default = pass all, Logging = enabled
Waiting 2 seconds for SCSI devices to settle
(noperiph:sym0:0:-1:-1): SCSI BUS reset delivered.

in my kernel conf:
device          ata
device          atadisk

with some weeks before i was install the same kernel on the same machine and every thing was ok, but now???... i have a problem. 
can anyone tell me what it's my problem ?
10x (thanks)!