What is it

[prog]

I found this object while unpacking. I know what it is, even though I haven't had reason to use it in, oh, 16 years or so.



Do you know what it is?

(The thing on top is a plunger which presses straight down, and springs back up when released.)

Identified first by kyroraz in comments!

Comments

[cortezopossum.livejournal.com]

Back in the day I was told those things were 'evil' because if you bought a single-sided 5¼" floppy the flip side wasn't 'certified' and thus if you tried to use the back you risk losing your data due to questionable media.

I may have bought that line at first but enough people used the flip side and didn't have problems so I started notching mine too. I used to use an Xacto knife for mine.