linux-kernel - Re: [OT] Re: bug? VFAT copy problem

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Date:	Thu, 23 Nov 2006 20:38:48 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
Cc:	The Peach <smartart@...cali.it>, linux-kernel@...r.kernel.org
Subject: Re: [OT] Re: bug? VFAT copy problem

DervishD <lkml@...vishd.net> writes:

>  * Sergio Monteiro Basto <sergio@...giomb.no-ip.org> dixit:
>> On Wed, 2006-11-22 at 15:53 +0100, DervishD wrote:
>> >  * Sergio Monteiro Basto <sergio@...giomb.no-ip.org> dixit:
>> > > Have vfat a limit of a file size when copy ? 
>> > 
>> >     2GB, if I recall correctly. FAT32 itself has a limit of 4GB-1 for
>> > file size, but Linux restricts it even more (don't ask me why).
>> 
>> May I say that FAT32 have a bigger limit (at least on last Windows).
>
>     I really don't know, but from microsoft technical information
> (the first or second hit when googling for "FAT32 size limit"), the
> limit they specify in FAT32 is 2^32-1.
>
>     I may be wrong, but with 32 bits you cannot address more than
> 2^32 bytes, I don't know how can you create a bigger-than-4Gb file in
> a FAT32 filesystem without resorting to tricks like this:
>
>     forum.doom9.org/archive/index.php/t-20689.html
>
>     Looks like FAT-32 (don't ask me how because I don't know the
> internals) can store a file bigger than 4GB, but you cannot *save*
> it. So you won't be able to put the file you have back to any FAT32
> filesystem, I'm afraid.

Right. FAT's size field is 32bit, so *file* of FAT has limit of 4GB-1.
(Since directory doesn't have size, in theoretically it can exceed 4GB-1)

Hm.. Maybe MS added a new hack to FAT..?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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