10.08.2026
3 min
293
Microsoft is preparing new restrictions on external storage devices that could leave some users unable to access their own files. Starting in January 2027, Windows will block USB drives and other external devices using the ReFS file system by default, although the data stored on them will remain intact.
Microsoft has officially announced changes to how the ReFS (Resilient File System) file system operates, affecting all supported Windows platforms. The new restrictions are intended to improve operating system security by preventing the use of external storage configurations that the company does not officially support.
Microsoft developed ReFS after introducing the much more widely used NTFS (New Technology File System). ReFS is designed to handle large volumes of data while ensuring data integrity and resilience against corruption. However, using ReFS on removable media, including USB flash drives, external HDDs, and SSDs, has never been an officially supported scenario.
Despite this, Windows previously allowed users to connect such drives and access the files stored on them. Microsoft has now decided to restrict this functionality, explaining that the change is necessary to reduce risks associated with unsupported storage configurations.
The changes are being introduced in two stages. On October 13, 2026, Microsoft released a security update that enabled monitoring of external drives using ReFS. At this stage, Windows only records connections involving these devices without blocking their operation.
The next stage is scheduled for January 2027. After the relevant update is installed, Windows will block the mounting of external ReFS volumes affected by the new restrictions by default. An exception will be available if a system administrator manually changes the relevant settings.
The main risk is not data deletion but losing access to files through the operating system. Files stored on affected drives will remain intact, but Windows may stop opening these drives once the new rules take effect.
However, most everyday users are unlikely to notice any changes. As Wccftech reports, the vast majority of consumer USB flash drives, portable SSDs, and external hard drives use NTFS, FAT32, or exFAT file systems. These devices will not be affected by the new restrictions.
The changes are most likely to affect users and organizations that rely on ReFS to store data on external media. Microsoft recommends checking these devices in advance and moving important data to supported storage configurations. Users still have time to prepare before January 2027. Administrators can also use Windows event logs to identify external ReFS volumes that may be affected by the upcoming restrictions.
The announcement has received mixed reactions. Some users supported Microsoft’s decision, arguing that the use of ReFS on external drives had long needed additional restrictions.
One participant in a Reddit discussion commented:
Windows 11 will block ReFS on USB drives, says it's officially unsupported, and weakens security
byu/MayankWL inWindows11
“It’s about time. Most of the horror stories about ReFS and Storage Spaces you can read on Reddit are related in one way or another to drives connected via USB.”
Other users were far more critical of the decision. On X, one commenter sarcastically wrote:
“Microsoft is doing everything it can to make 2026 the year of Linux on the desktop.”
Another user was even more outspoken, urging people to abandon Windows in favor of Linux or Apple devices:
“I don’t understand why anyone still uses Windows at all. Especially for personal use. Use Linux. Use Apple. Whatever… Just stop using Windows and giving money to Microslop.”
Some users also suggested that the ReFS restrictions could be part of broader changes to Windows. One commenter on X expressed suspicion that Microsoft was preparing additional restrictions on how the operating system could be used:
“I have no idea what this is or why they’re doing it, but knowing Microsoft, it’s something anti-consumer designed to prevent users from bypassing future restrictions in its closed ecosystem.”
However, there is no evidence that the new ReFS policy is connected to any additional restrictions Microsoft may introduce in the future. The company says its decision is driven by security concerns and the need to eliminate unsupported storage configurations. For most users with standard USB drives, nothing will change, while those using external ReFS drives should check their devices before January 2027.
