This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl.


Model Name: LT-1

Type: Magnetic disk

Recording method: Magnetic recording

Size: Approx. 49.5mm (actual measurement)

Capacity: 720KB

Year introduced: From about 1989

LT-1 was a floppy disk-type media that featured a compact disk size of about 2 inches, but had the same 720KB capacity as the 5.25-inch and 3.5-inch 2DD.

Since only the "Zenith MinisPort" laptop PC used it, it was not well known, and was sometimes mistaken for VIDEO FLOPPY, which is also classified as a 2-inch floppy disk.

The specifications of the Zenith MinisPort include an 80C88 CPU, 1MB or 2MB of memory, 640 x 200 dot LCD (CGA, 80 x 25 text), FDD for the LT-1, and a weight of approximately 2.7 kg. The operating system was MS-DOS 3.3 built-in ROM, which could be used without booting from the LT-1. An optional 3.5" FDD was also available so that you wouldn't have to worry about exchanging data with another PC, and a data transfer program using serial and parallel ports was equipped as standard.

The LT-1 was manufactured by Fujifilm. The company makes all kinds of film-based magnetic disks. I don't think it is sold in Japan, but it was labeled "MADE IN JAPAN".

The cartridge size of the LT-1 is 60 x 54 x 3 mm as measured; with the logo facing up, the direction of insertion into the drive is to the right, where the arrow is located.

The upper right window is a write-protected notch, and by sliding this switch on the backside, you could set whether it was write-protected or allowed. The shutter is made of resin and closes automatically with a spring. It does not have a locking mechanism, you can easily slide it open with your finger to see the disc.

The photo above shows the shutter open. Even though there is a connection to the motor in the center, the basic structure is similar to that of the 3.5" FD, and if you only look at this photo, it looks a bit like an elongated 3.5" FD.

I mentioned above that it can be mistaken for a VIDEO FLOPPY, but let's see how similar it is, and put them side by side.

Left is LT-1 and right is VIDEO FLOPPY. With the logo on top, the direction of insertion is different, with the former on the right and the latter on the left. VIDEO FLOPPY's shutter is made of metal and has a springless lock. The size is the same, but the shape and structure of the shutter are quite different.

Let's compare the two side by side, even with the shutter open. The size of the window of LT-1 is about half the size of VIDEO FLOPPY. In this way, you can see that the only similarity is the size and they are completely different.

LT-1 appeared as a small FD, but there was no drive that could be used with other PC, and it had to be used only for MinisPort basically. Although the successor model "MinisPort HD" appeared in 1990 which became the next year, this model installed HDD of 20MB instead of 2 inch FDD and LT-1 could not be used.

After all, other than the original MinisPort, there was no PC with 2 inch FDD and LT-1 was not used anymore.

Series: Sweet Memories


References:

2-inch floppy disk (LT-1), Museum of Obsolete Media

Zenith MinisPort, oldcomputers.net

PC MAGAZINE OCTOBER 17 1989 P276, Google books

2-inch floppy disks, Floppy disk variants, Wikipedia


This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl. The Japanese edition of Engadget does not guarantee the accuracy or reliability of this article.