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Re: [OM] Digital dweeb needs help

Subject: Re: [OM] Digital dweeb needs help
From: Rick Beckrich <rbeckrich@xxxxxxxxx>
Date: Thu, 9 Aug 2012 11:25:27 -0400
You may have marked it. Could be the card is plum worked out. I haven't
used this camera & card for several months, but both had worked faultlessly
with this laptop for years.
Add to that, it's an off-brand card whose name I can't recall at the moment.

..
On Thu, Aug 9, 2012 at 7:50 AM, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx
> wrote:

> Actually, I think I would do a "full format" on the PC first followed by
> a format in-camera followed by shooting a bunch of test images followed
> by a read test in the PC.  If it fails after that throw it out.
>
> I've been trying to think of what sort of malady might cause the problem
> described and not coming up with anything to my own satisfaction.  The
> PC thinks the directory is empty so there are bits somewhere the PC
> isn't reading correctly and/or the camera doesn't care about.
>
> When a camera formats a flash card it only does a "quick format" which
> just zeros out the directory without erasing any of the image data.
> When a PC does a format it also normally does a quick format but can
> optionally do a full format.  A full format does a write to and read
> back from every sector on the media.  If a read fails the sector will be
> marked as bad and not used again.  That's at least what happens with a
> hard or floppy disk.  Exactly what happens with a flash card which
> employs "wear leveling" I don't know.  Although not mechanical, flash
> cards do have a maximum number of write cycles.  Sectors near the front
> of the media would normally get more usage than those at the back since
> the media is rarely completely filled.  To keep the front sectors from
> wearing faster the actual physical locations of sectors 0, 1, 2, 3, etc
> don't correspond to their addresses.  The physical locations are
> continually remapped to assure even usage across the media.  I assume
> that the remapping algorithm knows how to take care of marking bad
> physical sectors but don't know that for sure.  Regardless, I would
> still recommend following my advice in the first paragraph.
>
> Chuck Norcutt
>
>
> On 8/8/2012 12:45 PM, piers@xxxxxxxx wrote:
> > Never mind trying to diagnose the problem, Rich, find a way round it -
> > connect the camera to the PC via USB (you may need to bring the car
> > into the house for this, unless you can extract the G5 from the car!).
> > Having done that, you should be able to copy the image files to the
> > PC. Then reformat the CF in the camera. Good lick!
> >
> > Piers
> >
> > On 08/08/2012, Rick Beckrich <ribec@xxxxxxxxx> wrote:
> >> I cranked off some shots at last night's National Night Out celebration
> at
> >> the nearby town of North Beach on the lovely Chesapeake Bay.
> >>
> >>   Played back on the Canaon G5, some of the images looked worth
> exploring
> >> further.
> >>
> >>   However, when I booted the CF card to my laptop, the Zoom Bowser told
> me
> >> "No Pictures!"
> >>
> >>   Actually, it said "no images to download."
> >>
> >>   This morning I took the card back out to the G5 (It's my
> >> keep-in-the-car-camera) and hit play - Voila!
> >>   30+ frames, some good.
> >>
> >>   Back to the computer - SAME ZIP AS EARLIER.
> >>
> >>   Tried downloading with an HP program... same answer.
> >>
> >>   Help... PLEASE!
> >>
> >>   Analog Rick
> >> --
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> >>
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>
>
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