Basically it's just that, slack. It is a lack of something, or in this case memory. If you have slack on your PC your files have bits in between them, taking up space that is not being used. It is the difference between physical size and logical size. File slack is also related to computer fragmentation where storage is used inefficiently. I believe on PCs you have an option of defragmenting your hard drive to relieve space.
Primary and Secondary storage.
no
The What?
1.5 TB of storage
You can't unlock storage wallpapers.
You can not use PS2 games onto a PC the data storage is different and will not run on a PC.
You have to plug the cell phone into the pc with a usb plug. The pc will recognize it as a storage device. Follow the screen prompts.
A storage device
no, it is false
You can purchase PC data storage devices at your local electronics store. Or you can buy one at auction websites. Try to find the least expensive one.
Stores your Pokemon if you have beyond six in your team
It depends on PC memory