FAT : FAT16 support maximum 4GB file/vol size like WinXP or 7.

FAT : FAT16 support maximum 4GB file/vol size like WinXP or 7.

[NamJae Jeon]

Hello Hirofumi

Win NT/XP/7 increased the maximum cluster size to 64KB, and file/vol
size increased 4GB also.

Although increasing , the file size of  linux FAT is still limited at 2GB.

I found that it is limited by sb->s_maxbytes(0x7fffffff) when
partition is formatted by FAT16.

I think that sb->s_maxbytes in fill_super should be set to 0xffffffff
like Fat32.

I want to know your opinion.

Thanks.

Re: FAT : FAT16 support maximum 4GB file/vol size like WinXP or 7.

[OGAWA Hirofumi]

NamJae Jeon <linkinjeon@gmail.com> writes:

> Hello Hirofumi
>
> Win NT/XP/7 increased the maximum cluster size to 64KB, and file/vol
> size increased 4GB also.
>
> Although increasing , the file size of  linux FAT is still limited at 2GB.
>
> I found that it is limited by sb->s_maxbytes(0x7fffffff) when
> partition is formatted by FAT16.

Yes. Now, only FAT32 allows it.

> I think that sb->s_maxbytes in fill_super should be set to 0xffffffff
> like Fat32.
>
> I want to know your opinion.

In my knowledge, Windows was limiting it as 2GB intentionally for
compatibility reason.

If Windows changed mind, I think it's good that we allow it too for 64KB
cluster. BTW, you can select FAT16 with 64KB on Windows?

Thanks.
-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

Re: FAT : FAT16 support maximum 4GB file/vol size like WinXP or 7.

[NamJae Jeon]

Hi.

And after modifing 0xffffffff, I confirm that it is working well such
as copying file of over 2GB size, etc..

Thanks

2011/7/26 NamJae Jeon <linkinjeon@gmail.com>:
> Hi.
>
> 2011/7/26 OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>:
>> NamJae Jeon <linkinjeon@gmail.com> writes:
>>
>>> Hello Hirofumi
>>>
>>> Win NT/XP/7 increased the maximum cluster size to 64KB, and file/vol
>>> size increased 4GB also.
>>>
>>> Although increasing , the file size of  linux FAT is still limited at 2GB.
>>>
>>> I found that it is limited by sb->s_maxbytes(0x7fffffff) when
>>> partition is formatted by FAT16.
>>
>> Yes. Now, only FAT32 allows it.
>>
>>> I think that sb->s_maxbytes in fill_super should be set to 0xffffffff
>>> like Fat32.
>>>
>>> I want to know your opinion.
>>
>> In my knowledge, Windows was limiting it as 2GB intentionally for
>> compatibility reason.
>>
>> If Windows changed mind, I think it's good that we allow it too for 64KB
>> cluster. BTW, you can select FAT16 with 64KB on Windows?
>>
> Yes, I can select FAT16 with 64KB cluster size on Windows when
> formatting usb storage of 4GB size.
>
> Thanks
>> Thanks.
>> --
>> OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
>>
>