On 16/01/07, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> If you now take image 6 it will be strung along right after 5 *unless*
> you've done some editing and deleted image 3. Depending on the DOS
> implementation, it might choose to place image 6 right after image 5 or,
> recognizing that there's a hole where image 3 used to be, it may decide
> to put image 6 in that empty space. All is still well if image 6 is
> able to fit in the hole but, if not, part of image 6 will fill up the
> hole and the remainder will be placed after image 5. At this point
> image 6 is no longer completely recoverable because the recovery utility
> has no way of knowing that it's missing its tail and, even if it did,
> has no way of knowing where the tail is.
This is possibly another argument in favour of always shooting RAW (or
maybe TIFF). These are always the same size (er, unless you change
the picture size... but I'll gloss over that), so image 6 will fit
exactly in the gap left by deleting image 3. Then again, filing
systems aren't always as smart as you think and might put most of
image 6 in the gap, thinking it's just a little bit too small, then
put the rest of it someplace else. Anyone with too much time on their
hands fancy testing this?
Come to think of it, a camera will probably fill up the rest of the
card before going back and filling in the gaps (to avoid excessive
writing to a particular bit of the card), so it'll probably get filled
with fragments from the last image recorded because the card capacity
won't be an exact multiple of the image size, i.e. there's not quite
enough room at the end of the storage space for the last image, so the
first part of it goes there and the rest of it goes into the gap left
by deletion... then if there are any more gaps, they get filled.
Yep, I think the KISS principle applies here.
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|