

In case you still do not know, an Android emulator is a software in which you can access Android apps and games on your PC. Just as a reference, Bluestacks has over 400 millions of active users and games.

Search for how to trim/compress VirtualBox images.Bluestacks is the most widely used Android emulators in the market. VirtualBox contains command-line tools that allows to compress images that have grown too large but don't contain much data. The main problem is that the BlueStacks is not aware which sector has been written before or not, hence if you write and delete files inside BlueStacks other sectors may be written and so the image file is growing larger the more often you use BlueStacks. This means that if the virtual machine writes data to a sector of it's virtual disk the will be appended to the virtual disk image the first time it is written to. To avoid allocating a full virtual disk size some virtual machines allow to allocate space on demand. From the outside from the beginning on the full virtual disk size is allocated in form of a file The file internally is then formatted as needed by the virtual machine and contains a lot of free space, but this free space is only visible inside the virtual machine. And to make this space available an image file is created of the chosen size. When creating the virtual machine you can decide of much memory (persistent not RAM) you assign to that virtual machine.

Such virtual image files can be created in two ways: BlueStacks is a virtual machine using image files that contain the whole "persistent memory" that is available to the virtual Android device.
