File systems using direct I/O are not supported.

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  • Updated: 05 Nov 2013


The following error is shown in the SAV.txt log file:

Scanning "<filePathHere." returned SAV Interface error 0xa0040202: Scan failed.

In the Windows System Event log you see:

Event ID 47
File systems using direct I/O are not supported.
Source: SAVOnAccess

The computer may also hang (lock up) during general use or a scheduled scan is running.

First seen in
Sophos Anti-Virus for Windows 2000+


This can be caused by the on-access scanner trying to scan file systems other than NTFS and FAT. It is also seen when data is on a virtual file store, which in some cases is presented to users through SQL and a front end application.

What To Do

Using the SAV.txt log file, create a set of exclusions for the paths mentioned in the log under Exclusions in your Anti-Virus and HIPS policy. Push this modified policy out to all clients that are affected.

If you need more information or guidance, then please contact technical support.

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