06-23-2013
The question can easily be answered with a 5-second google search for "AIX rhdisk hdisk". I suggest you read the first hit coming up on this search:
IBMs documentation.
Even without searching for anything your directory listing shows one to be a character-device and the other to be a block device.
For the future i suggest using google first and us second.
I hope this helps.
bakunin
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