Many a times, I study some topic or research paper and make my own notes (it could be figuring out the math in paper, or something else). But after say 7-8 months, these notes just pile up on table and when I look at them I don't think I will be using them for any future work. But I also feel like I'm trashing my study, and the effort was pointless if I dispose of it. Is it okay to dispose of them? What strategy do you have about disposing of written notes?
It may help you to understand that much of the value of those notes has been the very act of writing them. As such, you may find that you have less compunction against throwing them out.
Personally, I maintain an "aging pile" for notes, in which I keep them until they stop feeling relevant. For some things, that's a week; for others it was a box in my closet and a decade. You can also remove the physical clutter aspect by scanning and archiving in something with cloud storage: you'll be trading physical clutter for electronic clutter, but I at least find that electronic clutter is much easier to ignore.
You could always scan them and store them electronically if you feel that some of these notes may be beneficial in the future.
I personally kept the notes that I felt would be beneficial. Classes related to my major and classes I had taken an interest in, I would keep. Notes I had that didn't seem useful long-term, I would recycle. I would use this same strategy for your notes for papers. If it could be useful for a future paper, keep it. Otherwise, dispose of it.
Scan whatever you may need again at some point so you have an electronic copy. If possible, OCR it so you can search.
This point has been made by others before, but here's what I would do going forward: try to take as many notes as possible directly in a big txt file, so you don't need to scan and OCR it afterwards. You can always search for relevant keywords in your txt later.
And you may want to browse through Personal Productivity, specifically its note-taking tag.
When I make notes on a paper that I've printed, I make them on the paper. This means in the margins, on the backs of sheets (single sided printing has its uses). I haven't had to but extra sheets can always be added to the back. Then I can file the paper in some way (normally a disorganised folder on a particular topic).
The equivalent if I'm working electronically (not preferred, but useful on a train) is to maintain a text file (which would proably start as .txt, but if any complicated equations are required, would contain LaTeX and would only need a few lines to be compilable. This would be stored in the same folder as the .pdf and the .bib for the paper. Even though I might be reading the papwer on a tablet and making notes on my laptop, papers are stored on dropbox, so everything is kept together.
I'm naturally disorganised, a piles-of-paper sort of person and this works for me. Sketched-out ideas have to be typed in or photographed for long-term storage or I'll lose them.
I left academia some years ago. When I left university, my notes were all neatly stored in folders and then boxed up.
I never looked at any of those notes again. Eventually, I just decided that they were pointless clutter and dumped them in the recycling.
These days, if you need to know something, it's easier to look it up (in a book or on-line) than it is to wade through a pile of scribblings you did several years earlier.
Start the process of reviewing your notes and manually entering anything that you find useful electronically.
This is the only really viable way to get your handwritten notes into the computer. OCR is unlikely to help with handwriting, and scanning the notes as images just creates a "pile of papers" on your hard drive instead of on your desk. The information isn't any more accessible than it was before.
I did say start the process of manual review, not complete the entire process. After doing this for a short time, you might find that the review is quite useful and important ideas are jumping out at you. If so, keep on going. But you might find that it is a big waste of time. In which case, just throw away the pile of papers.
Do try to go digital in the future.
This doesn't help for the past, but in the future write your notes in a journal. And put them on a shelf when they are full. For important notes, use colorful page markers so you can find them later. If you no longer feel that a topic is important, just remove the page marker.
I picked up this habit from my husband, who startet doing it during his PhD. I found it very helpful during my masters and I continue to use it at work outside of academia.
edit: When you run out of shelf space, throw out the oldest journal that doesn't have any page markers.
I think most people here have said what I would say too, scan them.
The rationale behind scanning the notes is that they then are not lost in case you do want to get back to them, however, as others may have indicated, you should consider keeping the notes that you deem important on paper as it makes them a lot easier and more comfortable to read.
The other point people did not mention - when scanning, get a document scanner. Even a small document scanner will be a lot faster than a flatbed which would drive you insane. I have scanned many of my own notes - without my (Fujitsu) document scanner that would not have happened as not only is it faster than a flatbed, but it can do double sided scans too, effectively, put in a stack of papers, press a button and done. (Unless a problem occurs in which case the scan is interrupted and you are informed of the problem.) I would advise you to read reviews and compare different models before making a decision.
Some people have mentioned OCR: This is only practical for already a priory typeset and printed material. I have not seen nor found affordable OCR software that can understand handwriting. It may exist as a research code or maybe as a more expensive code but this is of little use to the more average consumer, plus you cannot be sure it will read notes correctly if they contain mathematical notation or similar (this would also apply for prints though).
Something I didn't do in my scans - but you should consider - is organising these in a coherent manner. Obviously use multi-page PDFs where content belongs together and possibly use folders/directories in the same way that you would use physical folders to help you find documents later on should you need to seek out any page.
In addition to other good answers... and as I intermittently sift through hand-written notes going back 35-40 years... :
Some things will have been truly, clearly superceded. Recycle.
Some things' disposition is less clear. One thing to do is to allocate some regular time to "reconsider/edit" such notes by typing them up (TeX, or whatever). And then you have an economical electronic (searchable!) copy. Then double-check that your typed version captures everything in the hand-written, and recycle.
Another point is that often organization by date, not by purported "topic", may work best. Or at least having things set-up so that it's easy to search by date... since often I realize that temporal proximity is more relevant than what I thought at the time about causality.
I am used to writing notes on different supports: post-its, text files... taken at very different moments (bedside, bus). Although I have a pretty good memory (with respect to most of my colleagues), I am amazed by how "a new thought" had appareared several times before in my notes, sometimes in a slightly different form.
Reading them again both refreshes and strenghtens those silent, unconscious cognitive processeses, described by many scientists, like J. Hadamard's The Psychology of Invention in the Mathematical Field, or H. Poincaré, that sometimes lead to those rare eureka or aha! moments.
I displine myself to always have something to take note (thoughts do not warn), to decorate my notes with a time and date, descriptions, mood, attitude and sights (was it rainy? what did it smell) to help me revive the moment when I read the note again, in a synesthetic manner. And I do my best to reopen old text files, to rebrowse old post-its once in a while, randomly.
I do not know if it is really effective, but I use it as a comforting ritual, for instance when I am not in mood to do real scientific work, and it does work as least like a placebo effect.
At least, I know it worked with dreams: taking notes of dream details in the morning helped me remember them more accurately, and dream them again with even richer details. It helped me getting rid of recurring nightmmares, by somehow completing them progressively, like one finishes a level of a computer game.
There have been some general remarks about scanning things in and digitization, but here is a system that I used when I was taking paper notes.
I had a manilla envelope for each project that I was currently working on - I might have had 2-3 irons in the fire, so to speak. I kept the most recent material to the front of the folder. Eventually the project would wrap up (or I went and got a better job ;)
At the end of the project, I would go through all the screenshots and annotations that I had made. I would have a lot of duplicates and a lot of information that was no longer relevant. This got discarded. Most of the other information I had already digitized (e.g. if I took Sketchnotes at a meeting, or added cases to our issue tracker). If I found any information that still needed to be digitized, I'd add it to a Wiki, issue tracker, or email, and then I'd move the folder to a filing cabinet or drawer.
It seems like this (or a similar process) would work for you.
Recycle the lot, now, without grief. The effort of reading / indexing / typing would overwhelm you, and squash whatever creativity you might still have. The act of taking the notes might have helped, but that is long gone. If you need the facts again, consult google / wikipedia / mathworld / whatever.
There is a narrow exception to this: keep unique records of (say) the medical histories of very unusual patients, or tasting notes of very rare wines, or whatever is the equivalent in your field. But if you aren’t Oliver Sacks, this won’t apply. In which case, the recycling calls.
I have notes going back about 20 years. (Notes means daily logs, [like a daytimer] and all of course work as a college student.)
I save everything, first because it was easy, and I liked having access to my info, though, like others, thought I'd really never need it.
Then my second reason arose when I needed the info itself, or needed to show when certain concepts were originally documented by me.
Make it easy on yourself. Take everything related to one project/study/class and put it in a pile. Don't sort it, don't make it all face the same way, don't fuss with it!
Give this pile a name. "Trigger Study - Small Mammals"
Take a ziplock bag and using a thick black permanent marker, write the name of the pile (BIG) just under the zipper.
Put the whole pile into the ziplock bag, zip it and stand it up in any long term storage container of your choice.
Walmart has clear Sterilite-brand tubs that work fine; clear helps you to see contents without manhandling it down off a shelf.
I use 2 gallon freezer bags... they hold about 400 pages. You can either break down any monster sized pile into multiple bags, or order zippered bags any size you can imagine. I use U-Line, but there are others.