1ST1
Veteran Member
The WD1002A-WX1 has NO Bios mounted.
It is never been with a Bios. See picture.
There is an explanation for that... The PC where that card originally has been installed has already harddisk support in it's main BIOS.
One of these exmples is Olivetti M24, M24SP, M21, AT&T 6300, Xerox 6060, Logabax Persona 1600
This one "ON" enables M24's internal harddisk BIOS which works fine with ROM-less WD/Omti/Seagate/... controllers. If you switch to OFF, then a controller with it's own BIOS is required. Don't use controller with ROM when switch is ON!