Windows partitions (h: and later) not supported

[pasci]

I'm monitoring an old Windows NT Server with many partitions. Zabbix get results for the partitions C: to G:. But, if I use the keys diskfree[h:] or disktotal[h:], zabbix report that this funtion isn't supported!

Is there any limits with the partition counter?! I'm not sure, but other releases before, I have also the same problem.

I'm using Zabbix 1.1alpha10 with precompiled zabbixw32.exe agent.

Thanks for your help