Primary Storage
Also known as internal memory and main memory, primary storage is a storage location that holds memory for short periods of times while the computer is on. For example, computer RAM and cache are both examples of a primary storage device. This type of storage is the fastest type of memory in your computer and is used to store data while it's being used. For example, when you open a program data is moved from the secondary storage into the primary storage.
Internal Storage
Internal storage is a term typically applied to any internal computer or system hardware component dedicated to the storage of data. The most well-known component is the hard disk drive (or hard drive), but other components include system memory ("RAM") and the BIOS/EFI/CMOS chips.
Secondary storage device
Also known as external memory and auxiliary storage, secondary storage is a storage medium that holds information until it is deleted or overwritten regardless if the computer has power. For example, a floppy disk drive and hard disk drive are both good examples of secondary storage devices. As can be seen by the below picture there are three different types of storage on a computer, although primary storage is accessed much faster than secondary storage because of the price and size limitations secondary storage is used with today's computers to store all your programs and your personal data.
USB Disk Security
Usb Disk Security is the best antivirus software to permanently protect offline computer without the need for signature updates, but other antivirus software should update signature database regularly, and they cannot effectively protect offline computer. This light and easy to use solution is compatible with other antivirus software and doesn't slow down your computer at all. You pay USB Disk Security once and get it all; however, other antivirus products should be paid for updates every year.