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A pair of mated head sliders with their platter removed. You can see that the tension of the head arms has caused them to press against each other.

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This illustration gives you some idea of just how small the flying height of a modern hard disk is (and today's hard disks have flying heights significantly lower than 3-7 millionths of an inch!

Extreme closeup view of a ferrite read/write head from a mid-1980s Seagate ST-251, one of the most popular drives of its era. The big black object is not actually the head, but the slider. The head is at the end of the slider, wrapped with the coil that magnet-izes it for writing, or is magnetized during a read. If you look closely you can actually see the gap in the core, though it is very small. The blue feed wire runs back to the circuits that control the head.

91

A pair of mated thin film head assemblies, greatly magnified. The heads are gray slivers with coils wrapped around them, embedded at the end of each slider (large beige objects). One feed line (with green insulation) is visible.

Closeup view of an MR head assembly. Note that the separate copper lead wire of older head designs is gone, replaced by thin circuit-board-like traces. The slider is smaller and has a distinctive shape. The actual head is too small to be seen without a microscope. If you look at the page discussing GMR heads you will see a diagram showing in detail where on the assembly the head is found.

92

Detailed structure diagram of a GMR head assembly. Notice how small these devices are: the scale is magnified twice to get to the detail level of the GMR sensor itself, and the arm/slider/head structure at top is itself only about a quarter of an inch long (see the illustration on the page covering MR heads to see what one of those assemblies looks like in real life.)

Closeup view of an MR head assembly. Note that the separate copper lead wire of older head designs is gone, replaced by thin circuit-board-like traces. The slider is smaller and has a distinctive shape. The actual head is too small

93

to be seen without a microscope. If you look at the page discussing GMR heads you will see a diagram showing in detail where on the assembly the head is found.

A pair of mated thin film head assemblies, greatly magnified. The heads are gray slivers with coils wrapped around them, embedded at the end of each slider (large beige objects). One feed line (with green insulation) is visible.

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