After reconditioning some Disk ]['s I found that they worked terrifically well with all software, when booting them in slot #6. Trying to boot from slot#4 created issues however. It was driving me nuts at first, when I didn't realize the solution (of using slot#6), and I was keeping slot #6 open for being able to quickly be plugging in and out an I/O card (for running a DuoDisk). I know the literature of the day always recommended slot#6, but I didn't realize that it was so critical as boot drive choice (a system standard really) with the Disk ]['s. Am I missing or forgetting something here?