The ext2fs notion of cylinder groups relies only on adjacency in
terms of linear sector numbers, disregarding the bogus logical
geometry reported by the disk. Even on modern disk drives, accessing
blocks closest in linear sector number is usually fastest, and the
ext2fs notion of cylinder groups exploits this. Locality of
reference in the linear sense thus still applies.
That's about right. Note that the ext2fs "notion of cylinder groups" is
called "block groups", in recognition that they have nothing to do with
physical disk layouts.
- Ted
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