I am trying to repurpose an old Acer Aspire M1641 to copy/format bulks of 3.5'' floppy disks. I think it's one of the last generations of computers to have a 34 pin floppy disk drive header as it also has SATA headers.
I have two working 3.5'' floppy drives, a floppy drive 34 pin cable connector with three ends (one for the motherboard, and two for A: and B: drives) and the motherboard has a 34 pin header.
I have connected the two drives to the motherboard's 34 pin header using the cable connector. I also connected the two drive's 4 pin power connectors.
When I boot and check the BIOS, I only have option for "Drive A:", there are no options for a "Drive B:". Windows only shows one of the two floppy drives, even if the second one seems to work (It seems like the drive takes the disk and spins it).
I tried changing the cable connector and changing the way it was connected but it was no use. I also tried other floppy drives and it did the same.
I couldn't find any specifications sheet about the computer's motherboard that told that there where only support for one floppy drive.
How can I get both floppy disk drives to work? Does the Acer Aspire M1641 motherboard supports two floppy disk drives?