讨论：文件系统概念中的extent应该怎么翻译？
翻译grub2的过程中遇到了这个词，ext4的文档中有这么一段：
......
2.4. Extents
The traditionally Unix-derived filesystems like
Ext3 use a indirect block mapping scheme to keep track of each block
used for the blocks corresponding to the data of a file. This is
inefficient for large files, specially on large file delete and
truncate operations, because the mapping keeps a entry for every single
block, and big files have many blocks -> huge mappings, slow to
handle. Modern filesystems use a different approach called "extents".
An extent is basically a bunch of contiguous physical blocks. It
basically says "The data is in the next n blocks". For example, a 100
MB file can be allocated into a single extent of that size, instead of
needing to create the indirect mapping for 25600 blocks (4 KB per
block). Huge files are split in several extents. Extents improve the
performance and also help to reduce the fragmentation, since an extent
encourages continuous layouts on the disk.
......
Wiki上也有类似的解释
http://en.wikipedia.org/wiki/Extent_%28file_systems%29
那么这个extent应该怎么翻译成中文呢？
连续块？
扩展块？
块扩展？
请大家给点意见。
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Best Regards,
Alex
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