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Check your BIOS settings. Check your pin configuration on the drive. Post a dmesg. Post the output of # atactl wd0 identify.

K, I just checked BIOS, every thing looks good to me.
Drive was working on other server, I just took it out of other server, that's why there is FreeBSD partition ...

# atactl wd0
atactl: wd0: Operation not permitted

# dmesg
OpenBSD 4.5 (GENERIC) #4: Sun Aug 23 19:01:40 GMT 2009
WHITE@Web:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel(R) Pentium(R) 4 CPU 2.80GHz ("GenuineIntel" 686-class) 2.80 GHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,P GE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE, SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,CNXT-ID,xTPR
real mem = 1063403520 (1014MB)
avail mem = 1019781120 (972MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 02/06/06, BIOS32 rev. 0 @ 0xffe90, SMBIOS rev. 2.3 @ 0xf0450 (66 entries)
bios0: vendor Dell Inc. version "A02" date 02/06/2006
bios0: Dell Inc. PowerEdge SC420
acpi0 at bios0: rev 0
acpi0: tables DSDT FACP SSDT APIC BOOT MCFG HPET
acpi0: wakeup devices VBTN(S4) PCI0(S5) PCI1(S5) PCI2(S5) PCI3(S5) PCI4(S5) KBD_(S1) USB0(S1) USB1(S1) USB2(S1) USB3(S1)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: apic clock running at 199MHz
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 8
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 4 (PCI1)
acpiprt1 at acpi0: bus 2 (PCI2)
acpiprt2 at acpi0: bus 3 (PCI3)
acpiprt3 at acpi0: bus 1 (PCI4)
acpiprt4 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0
acpibtn0 at acpi0: VBTN
bios0: ROM list: 0xc0000/0x9800! 0xc9800/0x1800! 0xcb000/0x1000
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel E7221 Host" rev 0x04
ppb0 at pci0 dev 1 function 0 "Intel E7221 PCIE" rev 0x04: apic 8 int 16 (irq 11)
pci1 at ppb0 bus 1
vga1 at pci0 dev 2 function 0 "Intel E7221 Video" rev 0x04
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
intagp at vga1 not configured
inteldrm0 at vga1: apic 8 int 16 (irq 11)
drm0 at inteldrm0: couldn't find agp
ppb1 at pci0 dev 28 function 0 "Intel 82801FB PCIE" rev 0x03: apic 8 int 16 (irq 11)
pci2 at ppb1 bus 2
bge0 at pci2 dev 0 function 0 "Broadcom BCM5751" rev 0x01, BCM5750 A1 (0x4001): apic 8 int 16 (irq 11), address 00:11:11:64:4b:85
brgphy0 at bge0 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0
ppb2 at pci0 dev 28 function 1 "Intel 82801FB PCIE" rev 0x03: apic 8 int 17 (irq 10)
pci3 at ppb2 bus 3
uhci0 at pci0 dev 29 function 0 "Intel 82801FB USB" rev 0x03: apic 8 int 21 (irq 9)
uhci1 at pci0 dev 29 function 1 "Intel 82801FB USB" rev 0x03: apic 8 int 22 (irq 5)
uhci2 at pci0 dev 29 function 2 "Intel 82801FB USB" rev 0x03: apic 8 int 18 (irq 4)
uhci3 at pci0 dev 29 function 3 "Intel 82801FB USB" rev 0x03: apic 8 int 23 (irq 3)
ehci0 at pci0 dev 29 function 7 "Intel 82801FB USB" rev 0x03: apic 8 int 21 (irq 9)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb3 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xd3
pci4 at ppb3 bus 4
ichpcib0 at pci0 dev 31 function 0 "Intel 82801FB LPC" rev 0x03: PM disabled
pciide0 at pci0 dev 31 function 1 "Intel 82801FB IDE" rev 0x03: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility
wd0 at pciide0 channel 0 drive 0: <ST340015A>
wd0: 16-sector PIO, LBA, 38166MB, 78165360 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
pciide0: channel 1 ignored (disabled)
pciide1 at pci0 dev 31 function 2 "Intel 82801FR SATA" rev 0x03: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI
pciide1: using apic 8 int 20 (irq 10) for native-PCI interrupt
wd1 at pciide1 channel 0 drive 0: <WDC WD400JD-75HKA1>
wd1: 16-sector PIO, LBA, 38146MB, 78125000 sectors
wd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 5
ichiic0 at pci0 dev 31 function 3 "Intel 82801FB SMBus" rev 0x03: apic 8 int 17 (irq 10)
iic0 at ichiic0
spdmem0 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-5300CL5
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci2: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci3: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
Kernelized RAIDframe activated
mtrr: Pentium Pro MTRR support
ugen0 at uhub4 port 1 "American Power Conversion Smart-UPS 750 FW:651.12.D USB FW:4.2" rev 1.10/0.06 addr 2
softraid0 at root
root on wd1a swap on wd1b dump on wd1b