Hi Mike,
The Bernoulli disks definitely do use servo, so as you say, if the servo
patterns are damaged the data is toast.
Do you have any advice on head cleaning? The docs on the second-generation
drive (Alpha-10H) just say to use a cleaning cartridge, and I don't have
one. I've cleaned floppy drive heads with isopropyl and a lint-free swab,
but I'm reluctant to do this to the Alpha-10 without advice from someone
who's done it.
Best regards,
Eric