Searching for specific PSX Bootdisk

[Gyromite]

I recently dug my Playstation out of the attic and I would like to play some of the games I haven't played in 8-10 years however I cannot find my PSX bootdisk. I do not have a modded PSX, but I remember that all I had to do was put in this bootdisk before every game, wait for it to ask me to put in the backup, and then I was off to the races. I can not find this disk anywhere.

What I remember about the disk was the graphic that spun around while it waited for the backup to be put in place. It was some kind of animal... a cow I think. If someone can help out by pointing me to a copy of this disk, I (and my 10 yr old nephew) would greatly appreciate it.