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While the PlayStation 2 did not come with a hard drive out of the box (except for the PlayStation 2 Linux Kit), the console featured an expansion bay on the back. This bay allowed users to install the official Sony PS2 Network Adapter, which conveniently housed an IDE hard drive connector.

The original may be a ghost town, but its spirit lives in every PS2 phat console running off a 2TB NVMe drive via a modern adapter. The software changed the way we thought about console limitations. It proved that Sony’s proprietary hardware (the 1394 i.LINK and IDE bus) was capable of vastly more than the official firmware allowed. hdloader.com