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Походу у newfs увеличили умолчальный размер блока »

Выяснил, зачем это сделали - это связано с поддержкой 4к-секторных дисков изкаропки:

FreeBSD's GEOM and file systems have intrinsically supported large (or even arbitrary) sector sizes for a long time, but there is still the issue of detecting them and communicating this information across the layers. Some new development introduced SATA quirks to detect known 4K drives (with the ability for users to set their own quirks on non-detected drives), the gpart(8) utility will calculate the correct alignment or warn on misalignment, and the default fragment / block size for UFS was changed to 4K / 32K.