Microsoft released the usual set of Patch Tuesday updates to supported Windows versions earlier this month. While the updates brought the usual bug fixes, improvements, and security patches, there were also known issues documented in the KB articles. However, one of the issues that wasn't documented, which users began reporting, was that of a problem with the chkdsk error-checking utility. The bug - supposedly introduced with KB4592438 - affects Windows 10 versions 2004 and 20H2, and causes the chkdsk /f command to affect file systems adversely, resulting in blue screens (BSOD) and corruption of the file system in the worst case. The issue seemingly affects SSDs and can be reproduced even when run on a virtual machine (VM). Microsoft has now acknowledged the issue, documented a workaround, and has begun rolling out a fix.