__I386_MAXDISKS

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#define DISKUNIT(dev) ((minor(dev) / OLDMAXPARTITIONS) % __I386_MAXDISKS)

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((minor(dev) / (__I386_MAXDISKS * OLDMAXPARTITIONS)) * OLDMAXPARTITIONS))

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((part) / OLDMAXPARTITIONS) * (__I386_MAXDISKS * OLDMAXPARTITIONS))

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#define DISKUNIT(dev) ((minor(dev) / OLDMAXPARTITIONS) % __I386_MAXDISKS)

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((minor(dev) / (__I386_MAXDISKS * OLDMAXPARTITIONS)) * OLDMAXPARTITIONS))

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((part) / OLDMAXPARTITIONS) * (__I386_MAXDISKS * OLDMAXPARTITIONS))