Plot time creation on hdd really slow?

Chia Plotting
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My findings :
2 plots on 2 disks in same time :
1TB SATA WD 7200rpm - 1 plot 13Hours 40min
1TB SATA WD 7200rpm - 1 plot 13Hours 20min

1 plot on 2disks in raid 0 (RAID Dell LSI 1068e):
1TB SATA WD 7200rpm in RAID 0 - 1 plot 12hours 20min

Conclusion - no worth to use RAID in my case.

2.5’ hdd 5400 rpm by USB - 17h 30min
2.5’ hdd 5400 rpm by SATA - 16h 40min

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I can do plots on 8:30 on seagate exos drives, and it’s not even IO bound, if i run one it can finish in 7:30, but i’m doing 7 parallel on the PC i work, each to his own disk.