Known Issues

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These are the most frequently encountered known issues. See also Missing ReactOS Functionality.

Audio

Code supporting audio is unstable. Presently, ReactOS's audio targets features of Microsoft Windows XP and Server 2003.

HD Audio or use of multiple audio cards at the same time are not yet supported.

Forum discussion, Creative EAX Aureal 3D and others in old games

DirectX

DX9 functions but at this time uses ReactOS's OpenGL acceleration support with the Wine project's wrapper code to provide DX9 support.

Forum discussion

Drivers

Drivers, Built in

Only a basic set of drivers are provided by ReactOS. Drivers for additional devices and drivers tailored for devices such as high-performance video cards must be installed manually.

Drivers, Manual installation of

Manual installation of some drivers is not always possible. The ReactOS driver stack may be missing functions that a third-party driver requires for its installation.

Drivers, Software for installation of

Software that automates the installation of hardware device driver software usually fails. Install drivers manually.

File Systems

EXT2

ReactOS can read and write ext2. However, support is not yet complete enough to allow installation of ReactOS on ext2 file systems.

FAT32

Well supported. At this time ReactOS can only be installed on a FAT32 file system.

NTFS

ReactOS can read NTFS. Write capability is being worked on. Much more debugging is required. Do not write on NTFS storage devices if any data on the device is valuable. NTFS support is not yet complete enough to allow installation of ReactOS on NTFS file systems.

UDF

UDF support (required for DVDs) is not yet bug free. May have problems when starting an executable file from UDF disc. May have to manually eject disc from drive.

Revision 74901 notes

CORE-4375

Forum discussion

Other

Why the ReactOS Project will not work on NTFS/ZFS/Reiser4/whatever right now

Installation

Installation from USB drives

Cannot install ReactOS from USB drives.

CORE-12648

Installation, required file system for

ReactOS can only install on FAT32 file systems at this time.

Mouse

Mouse pointer speed adjustment

Mouse pointer speed adjustment is not supported at this time.

CORE-13087

Mouse, USB device

See USB.

Multiprocessing

Not supported at this time. Even if the PC has multiple processors or multiple cores, only one core will be used.

Network

Network shares

Executable files cannot be run from network shares. This is believed to be due to missing functionality in the cache subsystem in the kernel.

Forum discussion

Built-in NIC drivers

ReactOS's network interface controller (NIC) driver support (i.e., Ethernet functionality) is only implemented for NICs based on the Realtek 8139 device. Clever people might be able to manually install the drivers for other NICs on their PCs. (There are no formal instructions to do this.)

Wi-Fi

Only Wired Equivalent Privacy (WEP) is supported at this time.

Forum discussion

Printing

The printing stack is incomplete. May be able to send raw ASCII text through parallel port, nothing else.

See also: Printing

Revision 75125 notes

Remote Procedure Call

Memory leak

Most Remote Procedure Call (RPC) client processes leak memory.

Forum discussion

Serial Port

Debugger connection

Debugger connection from target PC under test to host PC via null-modem cable consumes serial port COM1.

USB

USB stack is not yet fully functional. Attached USB devices including USB keyboards, mice, and touch pads (even if built into a laptop) may prevent ReactOS from booting, cause a bug check if attached after ReactOS is booted, or not be recognized by ReactOS. Most USB keyboards and mice will not work with ReactOS. USB storage devices will not work properly.