Microsoft's August update KB5063878 for Windows 11 has raised concerns among users regarding SSD storage devices, with reports indicating that certain SSDs may become undetectable by the system, potentially leading to file corruption. Initial reports suggest the issue occurs when SSDs are about 60% full after writing around 50GB of data, particularly affecting SSDs with Phison NAND controllers. Affected users have reported similar experiences on social media and Reddit, with indications that some HDDs may also be impacted. Microsoft has not confirmed any flaws associated with the update, and users are advised to consider postponing its installation. Additionally, some users faced error codes during installation, particularly via Windows Server Update Services, which Microsoft has since resolved. There are also reports of an error related to the "Microsoft Pluton Cryptographic Provider," which does not affect current functionality. Microsoft is encouraging Windows 10 users to upgrade to Windows 11 before the end of support in mid-October and has warned about the expiration of Windows Secure Boot certificates in June 2026.