https://auctions.c.yimg.jp/images.auctions.yahoo.co.jp/image/dr000/auc0
312/users/4f92de2852282d0c4055f15836cd43f760275f36/i-img1200x675-
1672137143s8ehmb271085.jpg
Looking at this picture it indicates the disk is 406TPI which is significantly higher than
the 96TPI used with 1.2MB HD drives.
Also from Wiki: 2TD drive in NEC PC-88 VA3 3 1⁄2-inch TD 1988 ca. 9.3 MB 12.5 MB[13]
(13 MB unformatted)
-Ali