microdrive

Does anyone use the subject and does anyone have it in
Moscow, Leningrad, that is, St. Petersburg, or anywhere else
with us?

It is also interesting if anyone uses floppy drives and floppy disks
3 inches exactly. There is a floppy drive for them from amstrad,
there are no floppy disks.

There is also an ANSI-approved standard (though it is unknown
whether implemented in hardware/plastic) for floppy disks with a diameter
6.5 mm... 13000-something DPI and only 24 tracks.