a crash. Nevertheless, Kennedy took the memory consumption for a critical bug that would derail Windows 7's launch and chastised Microsoft. Tom Warren of Neowin dismissed Kennedy's assessment of the alleged leak's significance. Steven Sinofsky of Microsoft also responded that Microsoft could not reproduce a crash either but that the massive memory consumption was by design, to improve performance, and not a leak. Ed Bott of ZDNet also reviewed the claim with his own tests and observed that no crash would occur. Noting that chkdsk /r, by design, does not work on the system drive while Windows is online, Bott concluded "it’s arguably a feature, not a bug, and the likelihood that you’ll ever crash a system this way is very, very small and completely avoidable." DR/Novell DOS DR DOS 6.0 also includes an implementation of the command. FreeDOS The FreeDOS version was developed by Imre Leber and is licensed under the GNU GPL 2. ReactOS The ReactOS implementation is based on a free clone developed by Mark Russinovich for Sysinternals in 1998. It was adapted to ReactOS by Emanuele Aliberti in 1999 and supports volumes using the FAT32 filesystem. The command does not support volumes using the Btrfs filesystem, although ReactOS supports it since version 0.4.1. See also Defragmentation Data scrubbing List of file systems e2fsprogs References Further reading External links Official documentation about Microsoft CHKDSK Open source CHKDSK implementation that comes with MS-DOS v2.0 External DOS commands Hard disk software Microsoft free software MSX-DOS commands OS/2 commands