I know you can do it on the PS2 and 3 with certain peripherals. Do similar ones exist for the PS1?

I ask because things like the Mega Memory Card and the Massive Memory Card only really work on an actual PS1, and I seem to remember hearing that they can corrupt save data. But, you know, I don't want to get all the endings in Bushido Blade and then have to delete them just to make room for the next game I play, you know?

(I actually do have a Mega and a Massive memory card, so if all the sour talk about them is baseless then I'll be happy)

Thanks in advance.