I initially got confused by the series names mentioned in this article. First, series 1, series 2, series 3 and series 4 were mentioned. Then, boot up times were mentioned for series 0, series 1, series 2, and series 4. I get that 2 refers to the third generation if we view it in terms of iteration starting with the number zero, but there’s no consistency in its usage in this article. What are the actual names?
S0, S1, S2, S3
or
S1, S2, S3, S4 (mentioned in this article)
or
S0, S1, S2, S4 (mentioned in this article)
S0 is not Apple’s official name for that one. That’s just what people in these forums have decided to call it.
Going by Apple’s official product lineup, the names are actually this:
1st Generation, Series 1, Series 2, Series 3, and Series 4.