[Qemu-devel] [Bug 1674114] [NEW] Bad sectors when using MS-DOS 6.22

[Mario]

Public bug reported:

When I try to install DOS 6.22 in QEMU, I get many disk errors when the
virtual disk is beeing partionized and formatted. When I later do a
SCANDISK, I can see many bad sectors and file errors.

I have tested this with the following disk formats: qcow2, vmdk, raw.

I tested this on Windows 7 with the following command line and QEMU version:
qemu-system-i386 -name "Windows 3.11 WfW" -machine isapc -cpu 486 -boot 
order=adc -m 32 -soundhw sb16 -hda disk1.qcow2 -vga cirrus

qemu-system-i386 --version
QEMU emulator version 2.8.50 (v2.8.0-12557-g0bd1f6b1b2-dirty)
Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers

I then did a test with the linux version of qemu, which gave me the same 
results.
Command line: qemu-system-i386 -name "Windows 3.11 WfW" -machine isapc -cpu 486 
-boot order=adc -m 32 -soundhw sb16 -hda disk1.qcow2 -vga cirrus -monitor stdout
Version: qemu-system-i386 --version
QEMU emulator version 2.1.2 (Debian 1:2.1+dfsg-12+deb8u6), Copyright (c) 
2003-2008 Fabrice Bellard

I also checked the disk image with qemu-img, with no results:

No errors were found on the image.
7986/8000 = 99.83% allocated, 0.20% fragmented, 0.00% compressed clusters
Image end offset: 523698176

Because I got the error with two different versions of QEMU, I think
this is a general problem and not related to a specific distribution.

I have attached a zip file with screenshots of SCANDISK, which shows the
disk errors.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: bad disk image sector

** Attachment added: "Screenshots of various disk read errors"
   
https://bugs.launchpad.net/bugs/1674114/+attachment/4840441/+files/failure.zip

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https://bugs.launchpad.net/bugs/1674114

Title:
  Bad sectors when using MS-DOS 6.22

Status in QEMU:
  New

Bug description:
  When I try to install DOS 6.22 in QEMU, I get many disk errors when
  the virtual disk is beeing partionized and formatted. When I later do
  a SCANDISK, I can see many bad sectors and file errors.

  I have tested this with the following disk formats: qcow2, vmdk, raw.

  I tested this on Windows 7 with the following command line and QEMU version:
  qemu-system-i386 -name "Windows 3.11 WfW" -machine isapc -cpu 486 -boot 
order=adc -m 32 -soundhw sb16 -hda disk1.qcow2 -vga cirrus

  qemu-system-i386 --version
  QEMU emulator version 2.8.50 (v2.8.0-12557-g0bd1f6b1b2-dirty)
  Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers

  I then did a test with the linux version of qemu, which gave me the same 
results.
  Command line: qemu-system-i386 -name "Windows 3.11 WfW" -machine isapc -cpu 
486 -boot order=adc -m 32 -soundhw sb16 -hda disk1.qcow2 -vga cirrus -monitor 
stdout
  Version: qemu-system-i386 --version
  QEMU emulator version 2.1.2 (Debian 1:2.1+dfsg-12+deb8u6), Copyright (c) 
2003-2008 Fabrice Bellard

  I also checked the disk image with qemu-img, with no results:

  No errors were found on the image.
  7986/8000 = 99.83% allocated, 0.20% fragmented, 0.00% compressed clusters
  Image end offset: 523698176

  Because I got the error with two different versions of QEMU, I think
  this is a general problem and not related to a specific distribution.

  I have attached a zip file with screenshots of SCANDISK, which shows
  the disk errors.

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