Orchid XP v7 nous apporta ses lumieres en ce 2007/11/12 13:58:
> Darren New wrote:
>> M_a_r_c wrote:
>>> "Nicolas Alvarez" <nic### [at] gmailisthebestcom> a écrit 
>>> dans le message de news: 473472c5$1@news.povray.org...
>>>> Fa3ien escribió:
>>>>> I've run a defrag, which freed 250 Mb.
>>>> Defrags free disk space??
>>>
>>> I am not an expert but maybe if it optimizes disk occupation by 
>>> filling blocks instead of letting empty portions of blocks.
>>
>> More precisely, if you have a fragmented file taking 3 blocks and 
>> filling them each only 10%, defragging that file will free two blocks.
> 
> More precisely, how would this situation arrise in the first place?
> 
> The allocation engine allocates a full block to a file, and does not 
> allocate any additional ones until the present ones are full.
> 
How can you assume that it only allocate a single block? NTFS allocate some 
cluster when you create a new file in an attempt to reduce fragmentation that 
appens when several files are created at once and randomly filled. Once the file 
is closed, the unused clusters are liberated. It does the same when all the 
file's alocated space is filled ant it need some more disk space. That 
prealocated space must reside in successive clusters.

-- 
Alain
-------------------------------------------------
Fix reason firmly in her seat, and call to her tribunal every fact, every
opinion. Question with boldness even the existence of a God; because, if
there be one, he must more approve of the homage of reason, than that of
blindfolded fear.
Thomas Jefferson

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