My drive is 7500rpm and is quite fast. Again, it was used in servers in its day. But of course, for some operations, a 10krpm drive can be faster. But it is not faster in every operation. Theoretically, an SSD with a PDS controller (bypassing the SCSI bus entirely) would be the holy grail of SE/30 drive replacements. But so far, no one has stepped up to that challenge. And I don't expect anyone ever will. There's no profit in it. It would be a labor of love.