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A two-spindle system is an ultra-slim notebook computer design. It has two internal storage devices, an integrated hard drive and an optical storage drive - such as a DVD, CD-RW or CD-ROM drive. Larger notebooks may be designed with three spindles to accommodate an internal hard drive, optical drive or floppy drive.
A two-spindle system is also known as a twin-spindle system.
When a second internal drive is installed in a two-spindle system, it is swapped with one of the permanent hard drives (such as the CD-ROM or DVD drive), which is placed in a removable drive bay.
Because a notebook computer's size, mass and cost are reduced in two-spindle systems, they are popular with users.
Floppy disk drives were prevalent from the mid-1970s to the late-1990s but are used on a limited basis in modern computing (such as legacy industrial computer equipment). Floppy disk drives have been replaced by external hard drives, Universal Serial Bus (USB) flash drives, optical disks and networks with multiple local and cloud storage resources.