problem.... solved!!! using Active@Recovery Software (for  ntfs)

both partition and all data are savely recovered!! no need to send it to data recovery center at lo yat... may be i will visit that hypermarket and told them how i did it..

thanks for your support

I'm kinda caught by this weird problems of drives reverting to Dynamic disks.

I suspect it could be the use of SATA hard drive. Possibly the SATA RAID driver bugs or operating system bugs which a "new drive" (if not recognized) will be converted to dynamic disk setup (this is similar to NRAID configuration). 

For those who did not encounter this problem yet, I suggest not to install any SATA RAID drivers but just the normal SATA drivers instead (most manufacturers have 2 driver versions - one for RAID and the other for non-RAID setup). 

Another thing to watch out for is disk spanning (used for dynamic disk setups) also... If you are not using it, then disable this.

So far I had 6 external USB HDDs (and all Seagates inside) and none of them had exhibit these kind of problems.

Anyway.. WHAT brand and model is that external HDD case?

There is a data recovery service in Low Yat though, on the 3rd floor. Its called SCS-Myung. I suggest you ask for pricing first before trying it.. it may be quite expensive. 

Reference: http://www.scs-myung.com/

Anyway would like to ask a few questions here:

Which WinXP operating system are you using? 
1. Home Edition
2. Pro Edition
3. Corporate Edition

What Serive Pack are you using?
1. No Service Pack installed
2. Pre-Installed SP1 (comes with the WinXP)
3. Updated to SP1
4. Updated to SP2

Did you intsall any drive utilities such as Norton Utilities?

Did you install any drive auto-defragment utilities like "Disk Keeper"?

Can you list down your detailed full PC hardware specifications?

For research.. need to know if there are similarities in these cases.