01-17-2020, 02:00 PM
Out of curiosity, I bought a Panasonic JU-455-7A14 5-1/4" 360K, 48TPI drive. It is the same basic design as the JU-475 but is only 360K. My motivation was to see how it worked w.r.t. some of the questionable C64 disks I had imaged on the JU-475.
It does not seem to have a jumper for ignoring the index sensor for motor operation like the JU-475 but it works on the backside of disks without a second index hole just fine.
I have tested a few disks I imaged with the JU-475 that had tracks marked in yellow and the JU-455 read them in fine. The extra width of the read head must help? Other disks I get the same or slightly different tracks marked yellow vs. green. Maybe due to slight differences in alignment?
It does not seem to have a jumper for ignoring the index sensor for motor operation like the JU-475 but it works on the backside of disks without a second index hole just fine.
I have tested a few disks I imaged with the JU-475 that had tracks marked in yellow and the JU-455 read them in fine. The extra width of the read head must help? Other disks I get the same or slightly different tracks marked yellow vs. green. Maybe due to slight differences in alignment?