I have and a Western Digital 1TB HDD and I am thinking bout getting an SSD to speed thing up but I would rather use ISRT than an SSD boot drive. My question is though, would i have to reformat my HDD to use ISRT
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No, you don't have to reformat your HDD. The only thing you have to do is change the SATA mode on the ports your HDD & SSD are to connected to to RAID mode.
So changing the HDD mode to RAID will not delete anything on the HDD