[cctalk] Re: Double Density 3.5" Floppy Disks

Also this article refers to a set of commands for this drive. The NEWM command formats a new disk. Link is https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=78 Sent from my iPhone On Apr 30, 2024, at 14:07, Wayne S <wayne.sudol(a)hotmail.com> wrote: What kind of floppies did Hp recommend to use with this drive? Sent from my iPhone On Apr 30, 2024, at 13:55, Fred Cisin via cctalk <cctalk(a)classiccmp.org> wrote: On Tue, 30 Apr 2024, John Herron via cctalk wrote: Yup, that's all I used to do. Some scotch tape over the floppy disk hole to make the system see it as DD. If it didn't automatically format as 720, you could specify size or sector count with format.com in dos. Somemedia sensors are optical; use opaque taps. I did hear folks say it wasn't always reliable (similar to 5.25 disks being formated on a high density drive) but I never saw any problems in my limited use. 3.5" are 600 VS 750 oersted; 5.25" are 300 vs 600 Oersted; a low density 5.25 formatted as "high density" won't do well; a high density 5.25" (1.2M) formatted as low density ("360K") sill self erase VERY soon, sometimes before you can even get it over to another machine. We had a college purchasing agent in bed with "Roytype", who kept giving us "1.2M" floppies ofr out TRS80s; they self erased very soon. -- Grumpy Ol' Fred cisin(a)xenosoft.com