microsoft / microsoft/Windows-driver-samples
FastFat can sometimes fail FilePositionInformation unnecessarily for read-only media
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@msscolee is already working on this.
Since Nov 11, 2025.
bug
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Description
FIC FilePositionInformation should be excluded from the IRP_MJ_SET_INFORMATION check here: https://github.com/microsoft/Windows-driver-samples/blob/d0b7e627fc4aebe6b9c3805a63d0aba4557433ab/filesys/fastfat/verfysup.c#L1707
It should work even for write protected media.
This can cause application failures e.g. opening pdfs using acrobat reader on read-only disks.
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