Second internal HDD on G3 Wallstreet possible?

[ReginOlmati]

I am new on old Mac topic and what I'm searching for is a second internal HDD for my Powerbook G3 Wallstreet.

Because the System drive - HDD 2 gb size - is a little bit small, but I won't upgrade this drive to bigger HDD.

I'm using too PC-Card Slots with CF (16gb HFS+ formated), but this seems not to be a full functional drive... Sometimes i have Data-writing-problems to the CF and also bidirectional Drag and Drop / Copying with CF doesn't work.

So, the best solution i think could be a HDD module for the 3,5" expansion bay or somethink like that. - Is this kind of device existing??

thank you