Asus P5A: 128GB CF recognized as 32GB. Need Help! \ VOGONS

Asus P5A: 128GB CF recognized as 32GB. Need Help!

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First post, by crusher

Posted on 2024-06-21, 19:44

crusher Offline

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Hello fellow Vogons,

since now I've used a 32GB Transcend CF successfully in my DOS machine.

Mainboard: Asus P5A (newest BIOS installed)
CF-IDE adapter: https://www.startech.com/de-de/hdd/35baycf2ide

Now I want to switch over to a Sandisk 128GB CF card.
What I've read the Asus P5A should be compatible with 128GB IDE drives.

The Auto detection feature recognizes the CF as 32GB drive.
I changed mode from normal to LBA to Large. No success. It always is detected as 32GB.
Experimenting with CHS values I have no luck.
This always throws me a "Hard drive not detected" error message during post.

Can anybody help?

Reply 1 of 9, by ux-3

Posted on 2024-06-21, 20:13

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Check mainboard firmware version.

Retro PC warning: The things you own end up owning you.

Reply 2 of 9, by riplin

Posted on 2024-06-21, 20:15

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Is your BIOS patched for larger drive support? If not, then that’s the problem. You can either Google 128GB support with your motherboard type and it should find it, or figure out how to patch it yourself with a BIOS mod tool.

Reply 3 of 9, by crusher

Posted on 2024-06-21, 20:31

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ux-3 wrote on 2024-06-21, 20:13:

Check mainboard firmware version.

Mainboard: Asus P5A (newest BIOS installed)

Last edited by crusher on 2024-06-21, 20:32. Edited 1 time in total.

Reply 4 of 9, by crusher

Posted on 2024-06-21, 20:32

crusher Offline

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riplin wrote on 2024-06-21, 20:15:

Is your BIOS patched for larger drive support? If not, then that’s the problem. You can either Google 128GB support with your motherboard type and it should find it, or figure out how to patch it yourself with a BIOS mod tool.

It should support 128GB by default.

Reply 5 of 9, by ux-3

Posted on 2024-06-22, 05:50

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crusher wrote on 2024-06-21, 20:31:

Mainboard: Asus P5A (newest BIOS installed)

It surely doesn't say "newest bios" but some ID number/string? 😉

Retro PC warning: The things you own end up owning you.

Reply 6 of 9, by crusher

Posted on 2024-06-22, 10:59

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ux-3 wrote on 2024-06-22, 05:50:

It surely doesn't say "newest bios" but some ID number/string? 😉

It's version "1011.005 Beta". Last BIOS released by ASUS.

Reply 7 of 9, by crusher

Posted on 2024-06-22, 11:00

crusher Offline

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I got it working 😀
Attached are the settings that work for me.
Now the CF is recognized as 128GB.

Reply 8 of 9, by wierd_w

Posted on 2024-06-22, 11:01

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What version of dos is this?

Dos 3 through 3.3 has a max fixed disk size of 32mb.

https://en.m.wikipedia.org/wiki/Comparison_of … erating_systems

Whoops, seconds too late!

Glad you got it working!

Reply 9 of 9, by crusher

Posted on 2024-06-22, 11:09

crusher Offline

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wierd_w wrote on 2024-06-22, 11:01:

What version of dos is this?

Forgot to mention, sorry.
I'm using MS-DOS 7.10 with FAT32 file system.

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