Hitachi 2.8" (was Preserving old floppies, fixed disks...)

Talking about disks for the Mattel Aquarius... Tony wrote... [snip/snip] OK, the floppies I have are NOT as described in Tony's last letter. These here disks are 77mm square, and do NOT have a shutter protecting the surface of the disk. I am sure the shutter is not missing; I have 10 disks all the same. From the circular midsection with a rectangular opening all the way to the edge, the access area on this disk looks like a large keyhole. Yet, the style is similar to a standard 3.5" floppy A side-note; these disks are advertised at having 144K unformatted capacity. Those interested can see the disks and drive at... http://www.comcen.com.au/~adavie/weird/aquarius/aqdisk.jpg http://www.comcen.com.au/~adavie/weird/aquarius/floppy.jpg I understand the drive is top-opening, like a CD-player, but I've yet to confirm this. I wonder if anybody knows of any other drives with this mechanism (floppies only!!) Cheers A