Why can't just delete sd card files on pc ?

Apareantly I have a stupid question! why can't just delete sd card files on pc instead of format it? especaily I tried it and the card kept working well!

If it works, why is there a problem?

Who told you (what web page) that you had to format SD cards to delete files?

You should be able to do so, If its not letting you it may be because the small tab on the left of the SD card is in the "lock" position, meaning you cant remove files.