If I've 2 separate HDD, can I plot in each one starting from position 0? Or are they overlapping?
I mean, 2 separate HDD, can overlap?
I'm using a miner for each HDD
yes, they are overlapped. use different nounces or different wallets.I tested it that before and lost one day in generating plots...
Good, it's a week that I'm wasting about 50% of my space..

And what if:
Number of nonces (1600000) is not a multiple of stagger size (8191)?
Because I'm mining and finding block, so does it affect mining?
I debug the miner before some days.Im not a java programmer,but i think this number (8191) is just thenumber of nounces'data that is generated in RAM memory and written on the HDD. So if you have 1600000 nonces, you have to mine on 1600000*256KB = 409600000 KB = 400000 MB =390,625GB.I use 2000 instead of 8191.It takes less ram.
Correct me , if im wrong.