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Disables track and cylinder caching in the DF driver for best performance, from discussions in Mellvik/TLVC#88.
When running QEMU caching is not disabled, since QEMU always emulates a 32-bit CPU. This makes testing the DF cache much easier on QEMU. This should not be an issue, since performance testing, even using IODELAY, remains less than realistic with QEMU.
This PR completes the long set of enhancements to the DF driver regarding cache and performance enhancements.