Can't enable anything above DMA(33) on my SIS5513 equipped laptop

[James Grimwood <pickoo@gmail.com>]

I've got a Packard Bell Easynote H5315 laptop. It contains an SIS5513
IDE controller.

Attached to it is a 60GB "SAMSUNG MP0603H" disk as hda, and a "_NEC
DVD+/-RW ND-6500A" DVD/CD ReWriter as hdc.

I can't seem to enable anything above UDMA2 for the HDD, and when I
burn CDs the drive attempts to run at 10x and the whole machine starts
becoming unresponsive - the mouse pointer in X jerks around, sound
stops and the buffer status of the CD drive jumps up and down.

I've tried doing "hdparm -Xudma5 /dev/hda", but when I type 'dmesg' I
get the following:

ide0: Speed warnings UDMA 3/4/5 is not functional.

Is this a driver problem since surely people still can't be making new
computers that don't support drive speeds above UDMA2... I bought the
laptop in December, so it's relatively new.

Now the thing I've noticed (and it's pasted at the bottom of this
email) is that the drive is connected to the motherboard with a
40-wire IDE cable. Is this because 80-wire laptop IDE cables don't
exist, or has someone tried to save money?

Is there any way I can make my drive faster?

uname -a shows:
Linux hex 2.6.10-gentoo-r4 #7 SMP Wed Jan 26 13:08:48 GMT 2005 i686
Mobile Intel(R) Pentium(R) 4 CPU 3.20GHz GenuineIntel GNU/Linux

When booting, this is displayed:
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller at PCI slot 0000:00:02.5
SIS5513: chipset revision 0
SIS5513: not 100% native mode: will probe irqs later
SIS5513: SiS 962/963 MuTIOL IDE UDMA133 controller
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:DMA
Probing IDE interface ide0...
hda: SAMSUNG MP0603H, ATA DISK drive
elevator: using anticipatory as default io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
hdc: _NEC DVD+/-RW ND-6500A, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
Probing IDE interface ide2...
ide2: Wait for ready failed before probe !
Probing IDE interface ide3...
ide3: Wait for ready failed before probe !
Probing IDE interface ide4...
ide4: Wait for ready failed before probe !
Probing IDE interface ide5...
ide5: Wait for ready failed before probe !
hda: max request size: 1024KiB
hda: 117304992 sectors (60060 MB) w/8192KiB Cache, CHS=16383/255/63, UDMA(33)
hda: cache flushes supported
 /dev/ide/host0/bus0/target0/lun0: p1 p2 p3
hdc: ATAPI 24X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20

This is the contents of /proc/ide/sis:
SiS 5513 Ultra 133 chipset
--------------- Primary Channel ---------------- Secondary Channel -------------
Channel Status: On                               On
Operation Mode: Compatible                       Compatible
Cable Type:     40 pins                          40 pins
Drive 0:
                UDMA Enabled                     UDMA Enabled
                UDMA Cycle Time    6 CLK         UDMA Cycle Time    6 CLK
Drive 1:
                UDMA Disabled                    UDMA Disabled
                UDMA Cycle Time    12 CLK        UDMA Cycle Time    12 CLK

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