I didn't see any model number, I had to use hdparm in Linux to actually find out. The product is a SanDisk 512 MB CompactFlash Card with model number SDCFB-512-A10.
However, I figured it out, some CF cards are factory-set to "removable mode" defined in the CF standard. I had to use the DOS application "ATCFWCHG.COM" to change the card to "fixed mode".