|"Some USB sticks have a tiny read only switch usually on the side. This may have been accidentally set to read only."|
In that case, if there is nothing else wrong, you should have no problem reading the memory card, even if you can't format it.
"The lock slider on my sd card is not on lock and i tried putting in 3 other sd cards into my card reader and the "You need to format the disk in drive F:\ before you can use it" pops up again. I'm kinda scared cause i have a lot of valuable footage that i cannot lose."
"i have tried it on 2 different computers and they work perfectly fine. So im guessing its the card reader here."
If the card reader is removable
- try it on the other computers.
- you may need to plug it into a different USB port on your computer, or use a different USB cable with it.
Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
Check that out first.
Rarely, not all the ports on the back of a desktop case may be able to supply 500ma each.
If you have a desktop computer, Note that I answered a Topic on this site recently where a guy had an external drive, which does require the full 500ma, connected to a port on the back of a desktop case - it would not work properly when a webcam was in the port next to it, but it worked fine when the webcam was unplugged. Ports on the back of a desktop case often have two ports connected to the same USB controller module that are ports one above the other - you could try connecting the cable to one of those and leaving the other un-used.