[CentOS] strange problem on regconizing /dev/sda and /dev/hda

Sun Jun 26 06:58:51 UTC 2005
Ceg Ryan <cegryan at gmail.com>

I installed a 4.1 x86_64 with kernel 2.6.9-11.ELsmp (rpm) initially. 
My box is tyan 5350 and a SATA harddisk
The install was successful and the harddisk was detected as /dev/sdaX

But strangely, when I first reboot my machine. The harddisk change to 
/dev/hdaX

What is the problem ?

Below are some of dmesg output

hda: WDC WD1200JD-00HBB0, ATA DISK drive
Probing IDE interface ide1...
Probing IDE interface ide2...
Probing IDE interface ide3...
Probing IDE interface ide4...
Probing IDE interface ide5...
Using cfq io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 1024KiB
hda: 234441648 sectors (120034 MB) w/8192KiB Cache, CHS=16383/255/63
hda: cache flushes supported
hda: hda1 hda2 hda3 hda4 < hda5 >
ide-floppy driver 0.99.newide
usbcore: registered new driver hiddev
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
mice: PS/2 mouse device common for all mice
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
NET: Registered protocol family 2
IP: routing cache hash table of 2048 buckets, 112Kbytes
TCP: Hash tables configured (established 524288 bind 37449)
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
ACPI: (supports S0 S1 S5)
ACPI wakeup devices: 
PCE0 PCE1 PCIX PCIB USB1 USB2 USBE KBC0 MSE0 
Freeing unused kernel memory: 164k freed
SCSI subsystem initialized
libata version 1.10 loaded.
ata_piix version 1.03
ACPI: PCI interrupt 0000:00:1f.2[A] -> GSI 18 (level, low) -> IRQ 193
ata: 0x1f0 IDE port busy
PCI: Setting latency timer of device 0000:00:1f.2 to 64
ata1: SATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0x1478 irq 15
ata1: SATA port has no device.
scsi0 : ata_piix
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