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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