Sunday, January 20, 2013

Advantages of HFS+

  • Adopting 32 bit to record number of allocation blocks: In HFS+ partition, there could be 232 allocation blocks at most in one partition. And adopting 16 bit to record number of allocation blocks, HFS only allows 216 allocation blocks at most in one partition. In HFS+ partition and HFS partition which have the same sizes, number of allocation blocks in HFS+ partition is larger than that in HFS partition. Thus, HFS+ partition has smaller allocation blocks and improves space use ratio and increases storable file number. 
  • Single file size is 263 bit at most: HFS+ supports single file of 263 bit at most and HFS only 231. So HFS+ can satisfy users' demands for large file storage. 
  • The size of directory tree node increases to 4KB: HFS+ not only has larger directory tree node, but also is able to change storage node size according to size of index node, which reduce wasted space and create a directory structure storing more information for quick index on ever accessed files. 
  • Supporting long file name: HFS+ supports file names with a length of 255 characters and HFS only supports 31 characters. So HFS+ can describe files more accurately. 
  • Faster boot speed: HFS+ identifies a boot fie with location and file size information in partition head. This boot file can be found easily when system boots, thus quickening system boot speed.

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