The Flicker image is
not accurate enough to differentiate between some of the roll film sizes. Here is a short list of common sizes:
35mm: 35mm wide, sprockets on both sides, 24x36mm image (8 sprockets / image) for full frame and 18x24mm image (4 sprockets / image) for half frame
110: 16mm wide, sprockets on one side, 13x17mm image
http://en.wikipedia.org/wiki/110_film
126: 35mm wide, sprockets on one size 28x28mm image, one sprocket / image
828: 35mm wide, sprockets on one size ~28x42mm image, one sprocket / image
127: 46mm wide, no sprockets, several images sizes standard with square 40x40mm images being the most common in the 1950's.
120: ~60mm wide, no sprockets, many image sizes standard
620, 105, 117: same film spec a 120 with varying spool sizes & paper differences.
220: same width as 120 but twice the length and different paper arrangement
116, 616: ~70mm wide, no sprockets, usually a 62x110mm image.
While 126 will fit in standard 35mm carriers, for either flat bed or fiilm only scanners, the 35mm carriers will mask a significant portion of the top of the image often preventing a usable scan. The same applies to 828 "Bantam" images. Mounted slides in either of these two formats also present problems. Similarly, mounted 4x4 square 127 slides, often called "super slides' and which used a 2x2" mount like 35mm, will fit 35mm slide carriers but will crop severly.
There are other formats that you may encounter when digging through old family images. There were a number of 16mm sub-minature formats, some very similar to the size of 110 and others somewhat smaller to allow for either a single row of sprockets or for two. There is also the Minox format which is 9.5mm wide film and an 8x11mm image. None of these sub-minature formats are likely in famaily snap shot collections unless there was a photo enthusiast in the family.
When the images get as old as the 1930's ,and earlier, you will encounter the occasional film pack negative. These can be anything from 2 1/4 x 3 1/4" to 4"x5" and 3 1/2" x 5 1/2".
There are also several proprietary roll film sizes that were made in the first half of the 20th century. These turn up occasionally. Manufacturers sometimes tried to lock the buyer of their camera into buying only their film. Kodak did this to an extent, but did it by changing the spool (e.g. the 120, 620, 105, & 117 family) which put less strain on the labs then and the scanner now.
Again, most dedicated film scanners only handle 35mm. Some handle APS with an optional attachment. Its possible, with many of these, to modify the negative carriers to get them to scan 110 but many of the auto functions (crop, exposure, ...) will have to be disabled. The more expensive (>$1000 USD) professional models sometimes hand 120 and occasionally 4x5 as well. These offer the possiblility of modifying carriers to handling 126, 828, and 127. Those that take 4x5 can usually be modified to accept 116/616 negs.
Flatbed scanners in the $200-1000 USD range more often handle 120 and some handle up to 8x10 (EPSON v700/750). I've used my EPSON v700 to scan many odd old formats. I build "adapters" for the odd film sizes using black poster board to allow the negs to fit the next larger carrier. These are easy to create and don't require any alteration to the negative carriers themselves. 127 Super Slides are the only ones that would require a permanent carrier modification. These I've just scanned by placing the slides on the scanners glass with some cardboard shims to raise them to the same height as a carrier.
Wikipedia, as usual, has some good information. Search using the format "620 film" replacing "620" with the film size number you looking for.
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