no static functions in WDK examples;

I don;t see any "static" functions in WDK examples. Even though there
are functions which are used inside only one file. Generally if a 'c'
function local to a file is declared static. Is there a technical
reason for not using static?
[I'm new to driver development so may this question is stupid.]

Are there any general guidelines for writing drivers (disk filter
drivers, to be more specific). Thanks.

Also how can I compare two MULTI_REG_SZ buffers returned by
IoGetDeviceProperty when called for DevicePropertyHardwareID?
Currently I'm just comparing each character (in a for loop) upto
ResultLength returned by IoGetDeviceProperty.

for (i = 0; i < propertyLength; i++) {
if (myHardWareID[i] != propertyBuffer[i]) {
break;
}
}

if (i != propertyLength) {
DebugPrint ("Not matched");
}
.

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