PlayStation 2 Expansion Bay
The PlayStation 2 Expansion Bay is a 3.5-inch drive bay of the PlayStation 2 gaming console that was introduced with the model 30000 and 50000. The bay is designed for the network adaptor and internal hard disk drive (HDD). These peripherals enhance the capabilities of the PS2 to allow online play and other features that were shown at E3 2001.
Source: Wikipedia
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