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[OM] Re: Ornery mood

Subject: [OM] Re: Ornery mood
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 17 Nov 2006 06:42:21 -0500
OK, thanks.  I understand sector wear leveling and realize there has to 
be a spot to store that data.

Chuck Norcutt

Mark Dapoz wrote:
> On Thu, 16 Nov 2006, Chuck Norcutt wrote:
> 
> 
>>Interesting.  Is it possible then that some sectors could be locked but
>>still appear as free space which the camera then interprets as a locked
>>drive becuase it can't write to what it thinks is unallocated space?
> 
> 
> The flash chip sectors have nothing to do with the file system (DOS) sectors
> which the camera/computer sees.  There's a layer of software between the
> flash chips and DOS called a flash translation layer (FTL) which provides
> the required mapping and also handles sector wear leveling.  That's one
> of the things the microcontroller in the CF cards does and it would be
> the only one that can lock the flash chips.  There may be a command which
> can be sent to the microcontroller by the camera to do the locking, but
> I have no idea if such a command exists.
>                                               -mark
> 
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