[cctalk] Re: Double Density 3.5" Floppy Disks

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' Fredcisin(a)xenosoft.com