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Wow, it has already been three years since a friend an I found a couple of old Macintoshes in a trash container1. Each of us picked one, and maybe a year ago or so I gave mine to him as I had no space at home to keep it. Given that he did not use them and that I enjoy playing with old hardware, I exchanged those two machines by an old Pentium 3 I had laying around :-) The plan is to install NetBSD-current on at least one of them and some other system (or NetBSD version) in the other one to let me ensure ATF is really portable to bizarre hardware (running sane systems, though).
Old hard disks exposed a lot of their internals to the operating system: in order to request a data block from the drive, the system had to specify the exact cylinder, head and sector (CHS) where it was located (as happens with floppy disks). This structure became unsustainable as drives got larger (due to some limits in the BIOS calls) and more intelligent. Current hard disks are little (and complex) specific-purpose machines that work in LBA mode (not CHS).