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Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts.... Here's what you can try: Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad.Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon. Thank you for using Fixya!
Try formatting the card- in most cameras there's a menu option under tools or system or something. If the camera still can't use the card, try the card in something else (like a computer memory card reader or an mp3 player with a memory card slot). If it always has errors it's probably defective
backup all your pictures and videos off the memory card and use the cameras format option to erase the card, this should solve any problems your getting with the memory card.
if not and you continue to get problems i would suggest you look at replacing the memory card with a new one (as they do only have a limited life). something from a recognised brand as well, like Kingston, etc as cheap memory cards tend to fail quite early in there life.
The memory card could be bad, try formatting the memory card, or the camera could be damaged. Look inside the memory card door, take out the memory card and look at the little pins in the camera that the memory card connects to. If any are bent or missing then the camera will need a major repair to be fixed. This is something for Canon or qualified technician to fix.
The problem is with the memory card. It probably just shorted internally and is no longer useful. The amount of memory is not the problem, as I used a 4GB card for a long time and my card finally went bad. You will just have to get another memory card and MAYBE find someone to be able to retrieve your data.
There is something alled the CIS header on Smartmedia cards. If that is missing or damaged, any compliant Smartmedia device will not let you use the card. Many card readers are not Compliant and thus ignore the CIS block.
It is advisable to not try and "recycle" cards with a damaged CIS block by using them in a non complying card reader because of one of the reasons why the CIS block is there is to ensure something called the bad block table is present on the card as well. The bad block table maps the locations of bad memory cells and prevents writing to them so the card will apear 100% good. All cards have some bad cells from the factory even. Most likely the bad block table will be missing as well and your non complant card reader will end up writing over bad memory cells which will cause future read errors and data loss.
You would need access to a compliant Smartmdia reader that is compatible with the SMPREP (or similar) formatting utility to fix problem smartmedia cards. SMPREP fixes the CIS block and scans the entire card for bad memory cells and updates the bad block table.