Input

input signal: signal going into an electronic system 

Inkjet Printer

An inkjet printer is a type of computer printer that creates a digital image by propelling variable-sized droplets of ink onto paper.

Source: http://en.wikipedia.org/wiki/Inkjet_printer

Information

Information in its most restricted technical sense is an ordered sequence of symbols that record or transmit a message. It can be recorded as signs, or conveyed as waves. Information is any kind of event that affects the state of a dynamic system. As a concept, however, information has many meanings.^[1] Moreover, the concept of information is closely related to notions of constraint, communication, control, data, form, instruction, knowledge, meaning, mental stimulus, pattern, perception, representation, and even entropy. 

Source: http://en.wikipedia.org/wiki/Information 

Hard Disk

A hard disk drive^[2] (HDD) is a non-volatile, random access device for digital data. It features rotating rigid platters on a motor-driven spindle within a protective enclosure. Data is magnetically read from and written to the platter by read/write heads that float on a film of air above the platters. Source: http://en.wikipedia.org/wiki/Hard_disk_drive 

Hardware

Refers to objects that you can actually touch, like disks, disk drives, display screens, keyboards, printers, boards, and chips. In contrast, software is untouchable. Software exists as ideas, concepts, and symbols, but it has no substance.
Source: http://www.webopedia.com/TERM/H/hardware.html

FireWire

FireWire is a method of transferring information between digital devices, especially audio and video equipment. Also known as IEEE 1394, FireWire is fast -- the latest version achieves speeds up to 800 Mbps. At some time in the future, that number is expected to jump to an unbelievable 3.2 Gbps when manufacturers overhaul the current FireWire cables.

Source: http://computer.howstuffworks.com/firewire1.htm 

Expansion Slot

An expansion slot usually refers to any of the slots available on a motherboard for PCI, AGP, ISA, or other format expansion cards. Sometimes the openings on the rear of the caseare referred to as expansion slots. 

Source: http://pcsupport.about.com/od/termse/g/expansion_slot.htm