Re: Differentiate FAT16 and FAT32
Re: Differentiate FAT16 and FAT32
- Subject: Re: Differentiate FAT16 and FAT32
- From: Alastair Houghton <email@hidden>
- Date: Sun, 10 Jan 2010 20:34:28 +0000
On 10 Jan 2010, at 20:04, Matthias Arndt wrote:
> In my app I have to differentiate between USB storage devices formatted with a MSDOS-FAT16 or with MSDOS-FAT32 file system.
Because? Remember that the flavour of FAT in use is defined *entirely* by the number of clusters on the volume... (i.e. it isn't something you can straightforwardly choose).
> Unfortunately both types are reported as "msdos". Is there any way to get the entry size of the used file allocation table? In the Finder every info dialog of a volume contains this information, so I was really surprised finding the mentioned method not differentiating both of them ...
According to the sources for the FAT filesystem driver (which you can get from <http://opensource.apple.com>), you can look at f_fssubtype in the statfs structure, which you can retrieve using statfs() or similar. See man 2 statfs.
This isn't exactly a Cocoa question, BTW... you should probably have asked on darwin-dev or one of the other lists.
Kind regards,
Alastair.
--
http://alastairs-place.net
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