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EEPiccolo said:
Using the weekly historical data here on VG chartz, at 30 weeks into the PS1 lifespan (June 25, 1995), it had the following numbers:
cumulative hardware: 962,377
cumulative software: 3,896,557
This results in a cumulative attach rate of 4.05

The weekly Wii data for June 24, 2007 shows:
cumulative hardware: 2,838,463
cumulative software: 6,644,098
This results in a cumulative attach rate of 2.34

Obviously the PS1 is higher as others in this thread have guessed. I'm too busy to do it right now, but now I'm curious to see how all the other consoles have done at the 30 week mark. Hopefully I can do that tonight.

And though this should be obvious to anyone paying attention to the thread, I'll state it anyway. This is Japanese data, not worldwide or US or anything else.

i just did that, so i now think the sources theory must be right, because; attach rate for consoles at 30 weeks, launched after 96. Dreamcast- 2.714 360- 2.606 GC- 2.460 Wii- 2.34 N64- 2.012 DS- 1.873 Xbox- 1.854 Ps2- 1.646 Ps3- 1.374 Psp- 1.350 GBA- 1.316 so it, cant [or shouldnt] be that either. wow the ps1 attach rate is huge for 30 weeks, the only one over 3 and it's even over 4