How to fix MS DOS Compatibility mode

**Visala28** · 08-02-2010

Hi,
How to fix the Ms-DOS compatibility mode in older version of windows. I need some more working information on the same. I know that it can be disabled by Windows registry key. I had found this in the windows settings. I had notice some of my hard drive running on the same. I want to stop this how to do that. Thanks in advance.

**JonathanD** · 08-02-2010

It seems that when Windows encounters a problem loading a driver FDI in protected mode, it adds the line Node to the key: HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ VxD \ IOS. To begin, it is therefore necessary to destroy this entry and then you bring drivers or directly copy the file - C: \ windows \ system \ Iosubsys.

**Macarenas** · 08-02-2010

To fix it fast just reboot your system. In principle, your problems should be solved. If they are not, the entry in the registry has been re-inserted. He must then take a look at your IDE ports and make sure that these ports are not occupied by incompatible devices. Check out that properly first. Because this many times is a ignored issue. You can check that an ensure the same.

**ThoMas321** · 08-02-2010

Indeed, the DMA mode for example requires the simultaneous use of IDE ports (in fact, the serialization). The presence of an IDE drive on the primary port and a CD-ROM on the secondary port is likely to create this kind of trouble with certain IDE controllers. Think of the move to change their scheduling.

**ZeDaX** · 08-02-2010

Also I have installed hard drive on primary ide and secondary ide cdrom on early because I had the 2 on the same sheet in primary ide but an exclamation point. The MS-DOS compatibility mode appears due to a disk problem when Windows starts with some disk controllers. It ensures better functioning pricipe drive by disabling all accelerators read-write.

**Sam.D** · 08-02-2010

In older versions of windows When a problem was detected, a variable in the registry is positioned. When this variable is set, and subsequent starts, Windows no longer the tests. The variable to change, to remove the compatibility mode MS-DOS, called NOIDE and changes as follows Run the registry editor and go to HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Services \ VxD \ IOS. Then Delete the keys and reboot your system.