booting vista external drive with laptop

I am pretty sure I have found the right hardware for booting Vista from an external SATA hard drive on a laptop. The laptop needs an ExpressCard/34 slot for this to work. Please see http://www.firmtek.com/seritek/seritek-2sm2-e/ You will also need http://firmtek.stores.yahoo.net/sataitol.html The drivers for XP are included on the cd. I do not know if the drivers will work with Vista, but they would be loaded at the Load Drivers button with the drivers cd in the drive and the 2sm2-e folder chosen. If XP drivers don't work I understand that SeriTek will be doing Vista drivers in time for rtm.
Warning: At this time Seagate drives are not detected by the adaptor. So far as I know, all others are detected. I have an Hitachi SATA drive that is detected by both XP and OS/X using this card and the supplied drivers. Neither of my laptops could see a Seagate drive in the enclosure, however. This is consistent with the information on the forums I have been reading.
For a typical SATA enclosure, see http://www.newegg.com/Product/Product.asp?Item=N82E16817145006 Be sure to click on the right thumbnail to get a good view of the back of the enclosure showing the usb and SATA connections. Mounting the hard drive in the enclosure is simple, but, of course, you must use a SATA drive even if you plan to only use it as a usb data drive. Do NOT try an IDE enclosure with a IDE/SATA bridge.
Among my many computers I have a MacBook Pro. I came across the SeriTek adaptor in an Apple forum and decided to check it out. At this point I am using an Hitachi 500GB Deskstar in an Athena Power enclosure and the SeriTek adaptor (with an eSATA to SATA cable) with the MacBook Pro.
I split the drive into one Windows partition and one OS/X partition. I dual boot XP and OS/X on the MBP (both from the internal drive) and both see and access the external drive just fine. It is detected as an internal drive, and that's why I see no barrier to using it as a Windows boot drive.
I have also tried the adaptor on my wife's Compaq Presario 4025US and it sees the Hitachi as an internal drive also. My wife is not about to let me try dual booting Vista x64 on her laptop (sigh), so I have not tried this out with Vista. I thought some of you might want to check this out. It is a way to avoid partitioning a laptop hard drive. In fact, if my wife will just relent, I plan to try both Vista x86 and x64 using it.