Low dvd-read rate for COMBO x48

ive bought this MSI 16x combo-drive x48 recently ... when used initially it was set to PIO mode in windows and max data transfer for a dvd wuz 2845 kB/s. sisoft sandra shows the drive as 2X.
Later i changed it to Ultra DMA Mode 2 . now still the max dvd-read rate is (4549 kB/s) .. sisoft sandra now showing this as 5X drive
these measurements were taken with SiSoft Sandra, DVD-Decryptor, v_Strip .. all new versions ..
ive tried several dvd's all original releases, with the same or in most cases lower performance ...
previously when using a 12X Aopen DVD-Drive i used to acheive speeds upto 12,500 kB/sec. while reading dvd's
Now according to your claims im supposed to get a performance of 21,000 kB/sec for DVD ? and im getting only a fraction of that performance ...
my system config is:
P4 2.4 Ghz 533FSB
Gigabyte 8PE667 Ultra 2 Mobo
MSI GeForce FX5600
512MB DDR333 (PC2700) TwinMos
400W Rhycom PSU
80GB Seagate Barracuda 2MB Cache
80GB Western Digital 8MB Cache
Creative Vibra 4D SoundCard
56K Rockwell Modem
MSI x48 COMBO Drive
Windows XP Professional (no service packs) ~2002
WinDVD Platinum 5
Adaptec ASPIi v4.71.2 (for winXp)
what can possily be wrong .. ie. sumthing with the windows that i shud check ? or sumthing with the mobo ide device setting(ATA33 ATA66/100) currently set in bios as Auto
i bought a 16X to give a better performance not to get this degraded performance ...
pls do send a reply soon .. or i mebe forced to think that MSI is only good at mobos !
renjith

Hi:
Try to install the drive as an only secondary MASTER.
In the primary channel, use the fastest HDD as MASTER and the slowest HDD as slave.
Note: USE The primary channel for the Hard Drives (HDD) and the secondary channel solely for the combo drive.
Hope that helps.
Edyros!

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