Storage Features

• SSD is the abbreviation of a Solid-State Drive, and HDD is the abbreviation of a Hard Disk Drive. See a smaller comparison between the two on slide 17. An HDD, since it is a disk, works by rotation for information to be retrieved from one of the disk's sectors (= areas.) An SSD, on the other hand, looks more like a memory stick and doesn't rotate or move to operate (which is why it is in 'solid state'.)
• 7000 RPM is the number of rotations per minute of a disk and tells the speed of the disk. This only applies to disks, like Hard Disk Drives and Magnetic Tapes, which work by rotation. The higher this number is, the greater the disk's speed is.
• 2TB (2 terabytes = 2 trillions of bytes) is the size of that secondary storage device. The greater the storage's size is, the more files, images, videos, etc., you can store on it.
• SATA, SAS, and SCSI are 3 common connectivity technologies of secondary storage devices. A certain computer might support only 1 of them, so you need to know which technology is supported by your computer before replacing secondary storage. This article and this article compare the advantages and disadvantages of these technologies.