// Prepare buffer with FileFsSizeInformation data
        byte[] buffer = new byte[100];
        int offset = 0;

        // totalAllocationUnits (8 bytes)
        SMBUtil.writeInt8(1000000L, buffer, offset);
        offset += 8;

        // availableAllocationUnits (8 bytes)
        SMBUtil.writeInt8(500000L, buffer, offset);
        offset += 8;