Can not read hard disk file correctly in recent build.

[ghost]

Describe the bug A clear and concise description of what the bug is. Can not read hard disk file correctly in recent build,all the information such as heads will lose,and fail to boot system from hard disk. To Reproduce Steps to reproduce the behavior:

1. Go to 'storage devices'
2. Click on 'browse'
3. Scroll down to 'hard disk file' and select.
4. Press OK and back to setting,see the errors.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Emulator configuration

• Machine: [e.g. IBM AT, AMI 486 clone etc] ASUS P55T2P4
• CPU:Pentium 75MHZ
• Graphics/sound cards:VGA
• Installed OS DOS 6.22

Host machine

• OS: [e.g. Windows 10, Ubuntu 18.04 etc]
• Emulator version
• Any other relevant information

Additional context Add any other context about the problem here.

[stefandd]

I believe this is a duplicate of #173