GPT Disk Manager: Does it work with a PCI controller card (sil3114)?

I have a 4-port PCI SATA card (SIL3114).

The BIOS is a non-RAID BIOS.

The drives are correctly recognized as 3 TB during POST.

The drives are correctly recognized as 3 TB in Windows XP -> Device Manager -> SCSI and RAID Controllers -> Silicon Image SIL 3114 SataLink Controller -> Device Info

But Device Manager -> Disk Drives shows them as "Type: Unknown", "Status: Unreadable".

Other 3TB drives on the very same PC are connected not to the add-in controller but directly to the motherboard SATA controllers and they are working 100% OK.

The same add-in controller on another PC (with Windows 7) works also 100% OK (without Paragon GTP Disk Manager, of course).

Is this a bug or some kind of limitation where not even your GPT Disk Manager helps?

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PS: I tried the newest BIOS (both RAID and non-RAID) and the newest drivers (both WinXP built-in and the newest drivers from the silicon image website)