Steffen Winterfeldt schrieb:
On Mon, 16 Mar 2009, jdd wrote:
Steffen Winterfeldt a écrit :
2012217344/512/46/47 = 1817.813...
2012217344 is the disk size. And that's independent of the 'geometry'.
why should it be? the geometry size is the only available and OS independant.
Geometry values are just gimmick and not really used for anything but for confusing messages.
No, especially for SSDs careful selection of Geometry values can be important: http://thunk.org/tytso/blog/2009/02/20/aligning-filesystems-to-an-ssds-erase... According to the nr. of heads* nr. sectors/head should a multiple of the erase-block size (most often 128MB), and all partitions should be aligned to cylinder boundaries. Especially the first partition of a disk is usually not aligned by default, because the first track, not cylinder, is excluded from it when you specify 1 as the starting cylinder. Not respecting the erase block size leads to file system block split over two erase blocks and therefore to worse performance and more erase blocks erased than necessary and so to shorter life time of the device.
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