MrSiemensGuy wrote on 2025-10-04, 20:47:

I have this Siemens Nixdorf Pro c5 specs: Pentium 133Mhz, 64M ram, HDD 40Gb (for testing), the Model of the motherboard is D943. The hard drive does not show up properly in the bios, its a Seagate Barracuda 7200.7, model: ST340014A, I found a 3 Drive IDE cable and connected it properly, I have tried different configurations on it on different IDE connectors, In the bios I can go to Hard drive 1 and select Autotype and it fills all the values, eg heads, cylinders, but it only shows up as 8.45Gb, I have LBA enabled and other options too, I tried the cable in different positions aswell, the manual I got is from https://www.manualslib.com/manual/769193/Fujitsu-D943.html anyone got any ideas on how I can solve this problem?

Hi,

I’m afraid the 40GB HDD is too large for this BIOS. These 1997/1998 BIOSes were usually limited to 8GB or 32GB.
However, if you have the latest Phoenix v4.05 Rev. 1.06.943.02 (128KB ROM) or 1.07.943.02 (256KB ROM) on your D943 board, you can manually set the BIOS to use 32GB of the 40GB drive.

In the BIOS Setup the BIOS will limit the CHS to 16383/16/63 when Autotyping an 8GB or larger drive. For the Heads and Sectors you can’t enter larger values, but the Cylinders value can be manually increased to a maximum of 65535. This amounts to 32GB and allows you to use most of your 40GB drive.
Here is a screenshot of this setting on a Rev. 1.06.943.02 BIOS

Cheers, Jan

Edit:
I did check that the Rev. 1.06/1.07 BIOS supports the Int 13h extensions so drives larger than 8GB can be used, and they do. This should allow drives up to 128GiB/137GB, however the BIOS Setup limits this to 32GB.

Thank you, this has to be the issue, luckily the bios can be updated from floppy (the manual supposedly says so) I'll see if I can find the stuff needed to update the bios later as I still need to get some floppy disks as the one I have just died

Broke**