"Bluestacks SD Card location on Windows
The SD Card of BlueStacks App Player is actually a file that resides on your computer. BlueStacks stores all SD Card data in that file. It's like a virtual storage drive used by BlueStacks. This file can be found in the BlueStacks Program Data folder of your System Drive (C:\Program Data\BlueStacks\Android if Windows is installed in C Drive). The Program Data folder is hidden by default, so you might have to enable "Show Hidden Files" to access the folder.
After you enable display of hidden files, you should be able to see a Program Data folder in the root of your System (Windows installation) drive. Go to Program Data >> BlueStacks >> Android. Here, you can see a file named "SDCard.sparsefs" (although it looks like a folder). We will create a new SD Card here and link it with BlueStacks."
So why not delete that?