Ting Tron

Here's a diff in MBR/PAT between the disk image created in VirtualBox and cf_dos_5. 

And there's the info with the CHS geometry: 62,16,63. Maybe that's what could be selected differently with VBoxManage. Something along these lines: [Geometry of imported disk images](https://forums.virtualbox.org/viewtopic.php?t=63454) ``` # Disk...

@TzOk83 - When you "locked new drives from mounting in Windows" -- How do you insert the CF to Windows (as CF or via an IDE adapter)? If I use...

So next I used this CF-IDE enclosure with IDE-USB interface, and created a virtual physical drive for VirtualBox and did fdisk and installed MS-DOS 5. Still getting "Missing operating system"....

Note this card is read and booted from in HP 200LX. Although it's treated like a removable drive (not hard drive) (There are config errors, but it boots and runs...

> @TzOk83 > I have noticed a different partition ID (01BE+04) on my and your image (06h vs. 04h). The Partition Type at 01BE+04: - 04 is FAT16 for up...

A few additional failed experiments: In these cases the card was zero'd, and raw copied raw disk (starting with MBR) using DD. - a different brand of 32Mb - "Missing...

> to clone the drive yet. Have you tried that? I don't have another 512Mb card. Cloning to 64Mb failed (see [above](https://github.com/skiselev/8088_bios/issues/59#issuecomment-1867326370)) I can also try to clone to a...

@lpsantil, @TzOk83 - Thank you for responding and ideas. Here's the `fdisk` details. One strange observation: why the OEM CF has End-C/H/S=61/254/63. So it has 255 heads? The other CFs...

@TzOk83 > does not support a 16-bit cylinder count (max cylinder should be 0FFh/255) So that may explain why the OEM CF card has 255 heads to lower the cylinder...