Sure I remember, but since I purchased Spinrite doing lowlevel was needed just once while changing ST-506 controller to a different type or for a new disk, former was quite much rarer needed.

Then even after std lowlevel it was worth using Spinrite to check if interleave value was proper. And if it wasn't it was worth letting it first before anything else. Same when changing a faster CPU as it could speed up IO so much that no interleave would not needed any more and get faster IO.

Spinrite was such a great tool and time saver fixing or making preventive periodic maintenance to customers disks, even though it chugged hours even 30M disks. And just because not to take absolutely any risk it was necessary to make full backup first, which that took quote long also. LapLink was a great tool for that, before LAN became more common.