was wondering where you would put the PSU
I have the identical case. and currently have 15 harddrives in there.
still room for 7 more. and have dual PSU in there as well.
Edit. I modded the bottom front to have 2 120mm fans and put 2 120mm fans between each row of harddrives.
I found the harddrives wern't getting enough airflow as it was. with your configuration and if you put 24 hardrives in the bottom even if they are all green drives i still think the temps of the dives will go above 50Deg c easy.
Just not enough air flow.
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