I regularly tell my clients not to delete their photographs. There are a number of reasons for this, but the most important one is that it can corrupt your memory. Data is placed down in rows, like bricks in a wall. Each brick is a different size, the data for every photograph is different, hence the different size files. If you delete one from the middle of the wall, the computer, an efficient machine, will put the next photograph (digital file) in the gap. Now as the hole is a different size, if it puts a smaller one in there, then it will add another until it is full. Once it is full, it will split the file into two pieces and seperate them. Here is where you can corrupt your memory.
There are plenty of other reasons you shouldn't delete your photographs. But this one, alone, is enough to make it a hard and fast reason.
Here are some other rules for memory cards:
- DO NOT erase images from your memory card in your camera!
- Format your memory cards in your camera, not on your computer.
- Speaking of formatting, it is a good idea to format your cards after each shoot.
- Use a good card reader!
- Don't fill a card completely.
- Don't pull a memory card out of your camera or card reader when data is being written or read from the card.
- If you have two card slots in your camera, write your images redundantly to both cards to have more peace of mind.
- Purchase name brand memory cards.