no UDMA for prim. slave HD?

I can't seem to get my primary slave hard disk to run in UDMA 5 mode.
I have 2 identical hard disks (60GB Maxtor) on the primary IDE as master &
slave.

DVD drive om sec. master IDE (UDMA 2)
DVD+RW on sec. slave.

Intel Application Accelerator says both HD's run in UDMA 5 mode.
Nero Infotool says the prim. slave drive is NOT in DMA mode.

I'm afraid the infotool might be right. Having both drives defragmentised,
and using a benchmark program, I get the following results:

C: 25 MB/sec.
D: 16 MB/sec.

This can't be OK. I need faster D: for video capturing.

Windows2000ProSP4 on C:
Windows swapfile on D:

I had both drives doing 25 MB/sec. This was under Win2kSP3 before
reinstalling Windows 2000...
Any solutions are very welcome!


--
MV

os: Windows 2kSP4 - mobo: Asus P4B266 - cpu: Intel P4 1,6 GHz. - mem: 512
MB. - video: Matrox Marvel G450eTV 32 MB. AGP - monitor: iiyama Vision
Master 1401 - sound: SB Audigy 1394 - hd: 2 X Maxtor 60 GB. - DVD/CD-ROM:
Toshiba DVD-ROM SD-M1712 - DVD+RW/+R: AOpen DVRW2412Pro - modems: ADSL:
Alcatel speedtouch 330 - analoog: Dynalink Lucent Win Modem 56k6 - printers:
HP DeskJet 720C & HP LaserJet IIP Plus - keyb: PS/2 MS Internet Keyboard -
mouse: Logitech Pilot Wheel Mouse Optical USB - removable: parallel Iomega
ZipDrive 100