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

On 1998-03-15 classiccmp(a)u.washington.edu said to lisard(a)zetnet.co.uk :However, there are 2 things that spring to mind. Firstly Hitachi :were associated with the Compact Floppy disks which are normally :called 3" disks. I've just measured one and : :It's a black plastic case measuring 3+1/8" * 3+7/8" * 3/16" :I've attempted to measure the actual disk through holes in the case, :and it meassures 2.8" in diameter, or thereabouts those'll be the things amstrad used ad nauseam, yep? you can post them for special concessionary cassette rates in japan, we're told - it kept them alive a little while longer than they should have stayed... ;> :Secondly, I've heard of 2.75" disk drives. Some of them were :_sequential_ access - there was no separate head possitioner, it :was driven by the spindle motor. You had to start at the outside of :the disk and read all the data up to the point that you wanted. quick disks. msx used them, as did a few early samplers (roland s10, akai s612(?), etc) and a few other bits. -- Communa (together) we remember... we'll see you falling you know soft spoken changes nothing to sing within her...