8000 Fat32 doesn't appear to support FSInfo · Issue #275 · DiscUtils/DiscUtils · GitHub
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Fat32 doesn't appear to support FSInfo #275

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Yazwh0 opened this issue Feb 12, 2023 · 2 comments
Open

Fat32 doesn't appear to support FSInfo #275

Yazwh0 opened this issue Feb 12, 2023 · 2 comments

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@Yazwh0
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Yazwh0 commented Feb 12, 2023

The FAT32 implementation doesn't appear to implement the FSInfo structure.

http://elm-chan.org/docs/fat_e.html#fsinfo
@LTRData
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LTRData commented Feb 12, 2023

The link seems broken.

@Yazwh0
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Yazwh0 commented Feb 12, 2023 •
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Strange, its working for me!

image

Have a workaround by calling this after each update.

    public void UpdateFsInfoFreeSpace()
    {
        var p = _data.Position;
        _data.Position = _bpbFSInfo * SectorSize;
        var fsInfo = StreamUtilities.ReadExact(_data, SectorSize);

        var usedSectors = UsedSpace / SectorSize;
        var freeSectors = TotalSectors - ReservedSectorCount - usedSectors;
        fsInfo[488 + 0] = (byte)(freeSectors & 0xff);
        fsInfo[488 + 1] = (byte)((freeSectors >> 8) & 0xff);
        fsInfo[488 + 2] = (byte)((freeSectors >> 16) & 0xff);
        fsInfo[488 + 3] = (byte)((freeSectors >> 24) & 0xff);

        _data.Position = _bpbFSInfo * SectorSize;
        _data.Write(fsInfo, 0, SectorSize);

        _data.Position = p;
    }

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