Maybe I'm the exception here, but I hate the long file names people use when renaming files.
I take advantage of the 1-seriies' ability to custom set the first 4 characters of the file name, and I use 1D-x (with the x filled in with a number), for the first 4 characters of the file name. I started out with '0' and now I'm up to '5' after about 2.5 years. What this does is put a 5th digit in the file number so I can effectively go up to 99,999 before the appearance of a reset of file numbers. Each time I approach the 9,999 rollover, I change the custom prefix by inserting a different number in place of the 'x' in my example.
With my other cameras (40d and 10d) I rename the files but only to add the 5th digit in the file number. But since these files are renamed, the file number does not accurately represent the number of shutter actuations like it does with my 1-series file names.
I categorize my photos in folders by date and subject, rather than renaming the individual file names. This also gives the added advantage of knowing exactly how many shutter actuations you have on your camera, with the filename revealing the actual total.
I have my file folders on the hard drive set up by year, month, and shot date, with the folder being named with the Topic and the number of the first photo in that folder. This enables me to also locate a photo by photo number when I am looking at the menu tree on the hard drive.
Example folder name: 08-0201 Amelia Island Tennis (1D-52124)
An example of the menu tree would look like this:
2008
01-2008 January
02-2008 February
08-0201 Amelia Island Tennis (1D-52124)
08-0206 Jacksonville Skyline (1D-52894)
08-0215 Tom's Birthday (1D-53045)
08-0215 Tom's Birthday (40d-2389)
There is a folder for each month, and then the subject folders as the example above, would be within the "02-2008 February" monthly folder. A monthly folder would have only as many subfolders within it, as the number of days I have been out shooting. But it is possible to have several subfolders with the same date and a different subject.
I additionally keep a log in an excel spreadsheet, and add a line for every day I shoot anything. It has columns for month and date and subject, and also for category and subcategory. This spreadsheet can be sorted by any of these columns to quickly find a particular photo folder if I have trouble looking on the hard drive itself, although this rarely happens. The spreadsheet also has columns to log in the number of the DVD which contains the backups of the photos.
In addition to the folders on my hard drives, I have separate backups of everything, both on external hard drives, and on DVD, just in case something gets lost.
This system has worked well for me since I switched to from film to digital, almost 6 years ago.
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Gallery at:
http://www.pbase.com/tim32225