Maximum Hard Drive size in HP Brio indcates that nearly all Brio models will boot with hard drives up to 135 GB, but the BIOS in most limits usable size to 8 GB in a lot of them. A few models appear able to run up to a 135GB HD, but the majority are limited in BIOS. There's a link on the page to an "accessories" page that may give you some clues about what you can do, although my "quick look" there didn't show anything.

I haven't found anything that says what a Brio is or what it's intended to do, except in Chinese, Thai, Korean, French, Russian, or German. It doesn't appear to be currently sold for US or UK markets(?). Has the chassis serial number been scraped off??????

A site search at HP gives no result for Brio, but suggests checking at a Support site. The only thing I find at the support site is a link to the same "Accessories" site noted above, and that site only shows printers, scanners, and cameras. You might find something with a site search at the HP site using a specific model number.

One blog inicates the Brio line was introduced in 1999, and there are a couple of blog reviews in year 2000 for models with a lot more capability than the earlier ones, although they don't really tell you what they were in either case. All the marketing quotes refer to "scalability" but I think in this context it means adding more machines to a simple network rather than to improving individual machines. I don't think the blog reviewers understood the difference (suckered by adspeak again). It was apparently intended for small businesses without a network server, with an emphasis on internet "connectivity" and basic PC function.

HP has merged with Compaq, and the line is probably no longer sold(?). eBay appears to put them in the "vintage PC" category.

John