I remember in the ipod days plugging a CD into the aul PC and ripping all the files as aac… A format that would only play in iTunes

What way do you have all these drives attached physically? Are they through USB and is there anything else also attached.

I had a similar issue of constantly corrupting USB HDDs, turns out the mini pc I was using couldn’t draw enough power to keep them all going simultaneously so they would fail and become corrupt.