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The company had previously announced the decision not to make a 20GB version available when PS3 launched in Europe last month, leaving it with just the single, 60GB version.

'For users who vigourously store

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[games and other entertainment content] in the PS3, 20GB is probably going to be too small, and even 60GB may not be big enough eventually,' Sony Computer Entertainment spokesman Satoshi Fukuoka said.

Fukuoka added that potential changes to the PS3 are not limited to its hard disk drive capacity.

'We are not likely to change its core components and functions such as the Cell, RSX, Blu-ray drive and network capability,' he said. 'But outside that realm, addition and deletion is quite possible.'

Sony packs the PS3 with its cutting-edge technology including the Cell microchip, dubbed 'supercomputer on a chip,' RSX graphic processor, and Blu-ray high-definition DVD player.

The advanced functions have driven up PS3's manufacturing costs, and Sony's game unit is estimated to have made a loss of more than 200 billion yen ($1.7 billion) for the year ended March 31, making the game console the biggest risk factor for Sony's earnings growth.