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Why the form says it need 3 disk instead 2?
In normal case minimum disk requirement for Normal Redundancy diskgroup is 2 but If you configure diskgroup for Voting disk and OCR disk with Normal redudancy then minimum disk requirment is three because Oracle Clusterware configure multiplex odd number of voting disk(i.e. 3) across the three different disk.
2. Why 3 ocr need 600m?
As far as OCR is concerned, it is maintained as like ASM file and since diskgroup redundancy is normal so ASM will maintained one mirror copy for OCR file. One OCR disk requirment is 300m so in this way for Normal redundancy diskgroup it become 600mb (one OCR file + one Mirror OCR file).