Nikon D70s digital camera

Plese select the auto mode, no ttl (SB28) also manually set the diaphragm aperture and iso and focal length, 0 compensation.
best regards

You should have a file protection option in the camera menu, access the picture, press the menu button and look for the protection options.

You can download the user manual from here:-

http://support.nikonusa.com/app/answers/detail/a_id/13570/~/user's-manual---d70s---guide-to-digital-photography

See if you qualify for the repair from Nikon for this issue: http://support.nikontech.com/app/answers/detail/a_id/13688

CF Card reading error.  Usually cheap cards, can be bent/tarnished/worn pins inside D70, this part can be replaced.

First read:
http://www.vandyll.net/?p=499

Then read
http://www.stephanmantler.com/wordpress/d70s-camera-repair/en/

CHA Error - not as bad as everyone thinks. Here is the solution, the second one has pics of how to fix the problem.

http://www.vandyll.net/?p=499

Then
http://www.stephanmantler.com/blog/d70s-camera-repair/

clean the battery contets or check the battery by 9v bulb

Yep, I solved mine by replacing the CF Pins at the bottom of the slot.  

See here:
http://www.vandyll.net/?p=499

and then here for pics on how to do it:
http://www.stephanmantler.com/wordpress/d70s-camera-repair/en/

First read:
http://www.vandyll.net/?p=499

Then read how, with pics: 
http://www.stephanmantler.com/wordpress/d70s-camera-repair/en/

Careful now....

I'm the same of you, only I went for the D40.
One general photography book that seems to be recommended by a lot of people is Understanding Exposure by Bryan Peterson (ISBN13: 978-0817463007 or ISBN10: 0817463003)
I've just bought a copy, so will comment with my own opinions later if you want :)

Can't really comment on D70-specific books I'm afraid.

The higher the ISO setting the more grain in the photo. Have you somehow set the ISO to say, 1600? http://www.nikondigitutor.com/eng/d70s/select.php?menu=1&sub=b11&num=12 Select ISO setting this way: http://www.nikondigitutor.com/eng/d70s/select.php?menu=1&sub=b05&num=10 Are you shooting in low-light situations (typically indoor)? Try shooting bright scenes and Auto mode, or manually set ISO to 100 or 200 and see if noise persists.