I am working with a Pentium 75 machine running Windows 98. Currently it has an IDE/CF adapter and all is well.

I am attempting to install a second identical IDE/CF with the identical CF card. It is set to Slave and positioned in the middle of the IDE cable. The bios sees the card and fills in the geometry correctly. However, upon booting, the message, “operating system not found” appears. If I remove the adapter and second drive from the bios, all is as it was before.

Any thoughts? Thank you.